Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income [Roll Forward]
Balance. beginning of period	$ (1,096)	$ 521
Other comprehensive loss before reclassifications:
Change in fair value of derivatives	6,683	(999)
Income tax effect	(2,079)	(36)
Net of tax	4,604	(1,035)
Amounts reclassified from accumulated other comprehensive income:
Oil and gas sales	3,044	(927)
Income tax effect	(1,132)	345
Net of tax	1,912	(582)
Net other comprehensive loss	6,516	(1,617)
Balance, end of period	5,420	(1,096)
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Balance. beginning of period	(688)	521
Other comprehensive loss before reclassifications:
Change in fair value of derivatives	6,683	(999)
Income tax effect	(2,487)	372
Net of tax	4,196	(627)
Amounts reclassified from accumulated other comprehensive income:
Oil and gas sales	3,044	(927)
Income tax effect	(1,132)	345
Net of tax	1,912	(582)
Net other comprehensive loss	6,108	(1,209)
Balance, end of period	5,420	(688)
Change in Valuation Allowance
Accumulated Other Comprehensive Income [Roll Forward]
Balance. beginning of period	(408)	0
Other comprehensive loss before reclassifications:
Income tax effect	408	(408)
Net of tax	408	(408)
Amounts reclassified from accumulated other comprehensive income:
Income tax effect	0	0
Net of tax	0	0
Net other comprehensive loss	408	(408)
Balance, end of period	$ 0	$ (408)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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