CAPITAL STOCK (Details) |
1 Months Ended | 3 Months Ended | 12 Months Ended | |||||||
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Feb. 01, 2016
shares
|
Mar. 31, 2018
USD ($)
|
Sep. 30, 2016
USD ($)
|
Dec. 31, 2018
USD ($)
$ / shares
shares
|
Dec. 31, 2017
USD ($)
shares
|
Dec. 31, 2016
USD ($)
shares
|
Nov. 26, 2018
USD ($)
|
Oct. 18, 2018
$ / shares
|
Feb. 09, 2017
$ / shares
shares
|
Aug. 10, 2016
$ / shares
shares
|
|
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Stock Repurchase Program, Authorized Amount | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 200,000,000 | Ìý | Ìý | Ìý |
Stock Repurchased During Period, Shares | shares | Ìý | Ìý | Ìý | 5,400,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Repurchase of common shares | Ìý | Ìý | Ìý | $ (47,500,000) | $ 0 | $ 0 | Ìý | Ìý | Ìý | Ìý |
Stock Repurchase Program, Average Price | $ / shares | Ìý | Ìý | Ìý | $ 8.78 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | Ìý | Ìý | Ìý | $ 152,700,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Dividends Payable | Ìý | Ìý | Ìý | 15,000,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Common Stock, New Shares, Issued | shares | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 63,250,000 | 44,400,000 |
Shares Issued, Price Per Share | $ / shares | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 10.75 | $ 6.75 |
Net proceeds from issuance of common shares | Ìý | Ìý | Ìý | 0 | 661,300,000 | $ 287,400,000 | Ìý | Ìý | Ìý | Ìý |
Debt Extinguished | Ìý | Ìý | Ìý | $ 227,400,000 | $ 1,610,700,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
Trading Day Window Determining Number of Common Shares Issuable on Conversion | 20 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Common shares, issued (in shares) | shares | Ìý | Ìý | Ìý | 301,886,794 | 301,886,794 | Ìý | Ìý | Ìý | Ìý | Ìý |
Common Shares Issued in Debt to Equity Exchange | shares | Ìý | Ìý | Ìý | Ìý | Ìý | 8,200,000 | Ìý | Ìý | Ìý | Ìý |
Gain (loss) on extinguishment/restructuring of debt | Ìý | Ìý | Ìý | $ (6,800,000) | $ (165,400,000) | $ 166,300,000 | Ìý | Ìý | Ìý | Ìý |
Common Stock [Member] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Dividends payable, per share | $ / shares | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 0.05 | Ìý | Ìý |
Common shares, issued (in shares) | shares | 26,500,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Convertible Preferred Stock, Common Shares Issued Upon Conversion | shares | 25,200,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Convertible Preferred Stock, Common Shares Issued Upon Conversion in Lieu of Dividend | shares | 1,300,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Exchange of Debt for Equity [Member] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Gain (loss) on extinguishment/restructuring of debt | Ìý | Ìý | Ìý | Ìý | Ìý | 11,300,000 | Ìý | Ìý | Ìý | Ìý |
$500 Million 3.95% 2018 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Face Amount Exchanged | Ìý | Ìý | Ìý | Ìý | Ìý | $ 17,600,000 | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Interest Rate, Stated Percentage | Ìý | Ìý | Ìý | Ìý | Ìý | 3.95% | Ìý | Ìý | Ìý | Ìý |
Gain (loss) on extinguishment/restructuring of debt | Ìý | Ìý | $ 19,900,000 | Ìý | Ìý | $ 1,800,000 | Ìý | Ìý | Ìý | Ìý |
$500 Million 3.95% 2018 Senior Notes [Member] | Exchange of Debt for Equity [Member] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Face Amount Exchanged | Ìý | Ìý | Ìý | Ìý | Ìý | 10,000,000 | Ìý | Ìý | Ìý | Ìý |
$218.5 Million 8.00% 2020 1.5 Lien Notes | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Extinguished | Ìý | Ìý | Ìý | Ìý | $ 218,500,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Face Amount Exchanged | Ìý | Ìý | Ìý | Ìý | Ìý | $ 512,200,000 | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Interest Rate, Stated Percentage | Ìý | Ìý | Ìý | Ìý | 8.00% | 8.00% | Ìý | Ìý | Ìý | Ìý |
Gain (loss) on extinguishment/restructuring of debt | Ìý | Ìý | Ìý | Ìý | $ 45,100,000 | $ 174,300,000 | Ìý | Ìý | Ìý | Ìý |
$218.5 Million 8.00% 2020 1.5 Lien Notes | Exchange of Debt for Equity [Member] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Face Amount Exchanged | Ìý | Ìý | Ìý | Ìý | Ìý | 20,100,000 | Ìý | Ìý | Ìý | Ìý |
$544.2 Million 7.75% 2020 Second Lien Notes | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Extinguished | Ìý | Ìý | Ìý | Ìý | $ 430,100,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Face Amount Exchanged | Ìý | Ìý | Ìý | Ìý | Ìý | 114,100,000 | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Interest Rate, Stated Percentage | Ìý | Ìý | Ìý | Ìý | 7.75% | Ìý | Ìý | Ìý | Ìý | Ìý |
Gain (loss) on extinguishment/restructuring of debt | Ìý | Ìý | Ìý | Ìý | $ (104,500,000) | 6,900,000 | Ìý | Ìý | Ìý | Ìý |
$700 Million 4.875% 2021 Senior Notes | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Extinguished | Ìý | Ìý | Ìý | $ 14,400,000 | $ 171,000,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Face Amount Exchanged | Ìý | Ìý | Ìý | Ìý | Ìý | $ 76,300,000 | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Interest Rate, Stated Percentage | Ìý | Ìý | Ìý | 4.875% | 4.875% | 4.875% | Ìý | Ìý | Ìý | Ìý |
Gain (loss) on extinguishment/restructuring of debt | Ìý | Ìý | Ìý | $ 100,000 | $ (2,800,000) | $ 33,300,000 | Ìý | Ìý | Ìý | Ìý |
$700 Million 4.875% 2021 Senior Notes | Exchange of Debt for Equity [Member] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Face Amount Exchanged | Ìý | Ìý | Ìý | Ìý | Ìý | 26,800,000 | Ìý | Ìý | Ìý | Ìý |
$1.075 Billion 5.75% 2025 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Proceeds from Issuance of Debt | Ìý | $ 500,000,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Interest Rate, Stated Percentage | Ìý | Ìý | Ìý | 5.75% | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Secured Debt [Member] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Extinguished | Ìý | Ìý | Ìý | $ 648,600,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Unsecured Debt [Member] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Extinguished | Ìý | Ìý | Ìý | 422,200,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
$540 Million 8.25% 2020 First Lien Notes | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Extinguished | Ìý | $ 35,600,000 | Ìý | Ìý | $ 540,000,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Interest Rate, Stated Percentage | Ìý | Ìý | Ìý | Ìý | 8.25% | Ìý | Ìý | Ìý | Ìý | Ìý |
Gain (loss) on extinguishment/restructuring of debt | Ìý | Ìý | Ìý | Ìý | $ (93,500,000) | Ìý | Ìý | Ìý | Ìý | Ìý |
$400 Million 5.90% 2020 Senior Notes | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Extinguished | Ìý | Ìý | Ìý | $ 88,900,000 | $ 136,700,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Face Amount Exchanged | Ìý | Ìý | Ìý | Ìý | Ìý | 65,100,000 | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Interest Rate, Stated Percentage | Ìý | Ìý | Ìý | 5.90% | 5.90% | Ìý | Ìý | Ìý | Ìý | Ìý |
Gain (loss) on extinguishment/restructuring of debt | Ìý | Ìý | Ìý | $ (3,300,000) | $ (7,800,000) | 28,300,000 | Ìý | Ìý | Ìý | Ìý |
$500 Million 4.80% 2020 Senior Notes | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Extinguished | Ìý | Ìý | Ìý | $ 122,400,000 | $ 114,400,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Face Amount Exchanged | Ìý | Ìý | Ìý | Ìý | Ìý | $ 44,700,000 | Ìý | Ìý | Ìý | Ìý |
Debt Instrument, Interest Rate, Stated Percentage | Ìý | Ìý | Ìý | 4.80% | 4.80% | 4.80% | Ìý | Ìý | Ìý | Ìý |
Gain (loss) on extinguishment/restructuring of debt | Ìý | Ìý | Ìý | $ (3,700,000) | $ (1,900,000) | $ 19,500,000 | Ìý | Ìý | Ìý | Ìý |