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Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES - BORROWING CAPACITY (Details)

v3.19.1
DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES - BORROWING CAPACITY (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Revolving Credit Facility [Member] Ìý Ìý
Line of Credit Facility [Line Items] Ìý Ìý
Line of Credit Facility, Maximum Borrowing Capacity $ 305,400,000 $ 323,700,000
Long-term Line of Credit 0 0
Line of Credit Facility, Remaining Borrowing Capacity 240,000,000 268,700,000
Letter of Credit [Member] Ìý Ìý
Line of Credit Facility [Line Items] Ìý Ìý
Long-term Line of Credit $ 65,400,000 $ 55,000,000