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Quarterly report pursuant to Section 13 or 15(d)

Goodwill And Other Intangible Assets And Liabilities (Estimated Useful Lives Of Intangible Assets Subject To Periodic Amortization On A Straight-Line Basis) (Details)

v2.4.0.6
Goodwill And Other Intangible Assets And Liabilities (Estimated Useful Lives Of Intangible Assets Subject To Periodic Amortization On A Straight-Line Basis) (Details)
3 Months Ended
Mar. 31, 2012
Y
Permits [Member]
Ìý
Finite-Lived Intangible Assets [Line Items] Ìý
Intangible Assets Estimated Useful Life Minimum (years) 15
Intangible Assets Estimated Useful Life Maximum (years) 28
Utility Contracts [Member]
Ìý
Finite-Lived Intangible Assets [Line Items] Ìý
Useful Life (years) 5
Leases [Member]
Ìý
Finite-Lived Intangible Assets [Line Items] Ìý
Intangible Assets Estimated Useful Life Minimum (years) 1.5
Intangible Assets Estimated Useful Life Maximum (years) 4.5