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Derivatives Derivatives by Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commodity Member [Member]
Derivative [Line Items]
Derivative Asset, Current	$ 16	$ 234,409
Derivative Liability	277,119	5,137
Derivative Liability, Current	67,139	5,137
Derivative Asset	29,612	278,948
Derivative Liability, Noncurrent	209,980	0
Derivative Asset, Noncurrent	29,596	44,539
Basis Swap [Member]
Derivative [Line Items]
Derivative Asset, Current	56,916	5,429
Derivative Liability	33,168	13,775
Derivative Liability, Current	11,575	1,569
Derivative Asset	92,519	6,522
Derivative Liability, Noncurrent	21,593	12,206
Derivative Asset, Noncurrent	$ 35,603	$ 1,093

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