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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

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