Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	$ (163,067)
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]
Ending balance	(199,655)
Gains and Losses on Cash Flow Hedges
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	947	$ 5,420
Other Comprehensive Income (Loss) before Reclassifications Tax [Abstract]
Change in fair value of derivatives	801	4,917
Income tax effect	(298)	(1,829)
Net of tax	503	3,088
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]
Oil and gas sales	(1,032)	(2,372)
Income tax effect	384	882
Net of tax	(648)	(1,490)
Net other comprehensive income (loss)	(145)	1,598
Ending balance	$ 802	$ 7,018

Accumulated other Comprehensive Income [Roll Forward]

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Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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