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Derivative Instruments Asset/Liability Derivative Table (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Commodity Member [Member]    
Derivative [Line Items]    
Derivative Asset, Current $ 6,408 $ 16
Derivative Liability, Noncurrent 122,747 209,980
Derivative Asset, Noncurrent 58,422 29,596
Derivative Liability, Current 25,838 67,139
Gas Cash Flow hedges 64,830 29,612
Derivative Liability 148,585 277,119
Basis Swap [Member]    
Derivative [Line Items]    
Derivative Asset, Current 2,745 56,916
Derivative Liability, Noncurrent 70,281 21,593
Derivative Asset, Noncurrent 12,722 35,603
Derivative Liability, Current 24,946 11,575
Gas Cash Flow hedges 15,467 92,519
Derivative Liability $ 95,227 $ 33,168