Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance			$ (251,095)
Other comprehensive income before reclassifications:
Change in fair value of derivatives	$ 2,179	$ (595)	5,045	$ 206
Income tax effect	(229)	45	(109)	(253)
Net of tax	1,950	(550)	4,936	(47)
Amounts reclassified from accumulated other comprehensive loss:
Oil and gas sales	(108)	(1,155)	214	(2,187)
Income tax effect	40	430	(80)	814
Net of tax	(68)	(725)	134	(1,373)
Net other comprehensive income (loss)	1,882	(1,275)	5,070	(1,420)
Ending balance	(253,437)		(253,437)
Gains and Losses on Cash Flow Hedges
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(981)	802	(2,983)	947
Other comprehensive income before reclassifications:
Change in fair value of derivatives	2,179	(595)	5,045	206
Income tax effect	(810)	221	(1,876)	(77)
Net of tax	1,369	(374)	3,169	129
Amounts reclassified from accumulated other comprehensive loss:
Oil and gas sales	(108)	(1,155)	214	(2,187)
Income tax effect	40	430	(80)	814
Net of tax	(68)	(725)	134	(1,373)
Net other comprehensive income (loss)	1,301	(1,099)	3,303	(1,244)
Ending balance	320	(297)	320	(297)
Change in Valuation Allowance
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(581)	0	(1,767)	0
Other comprehensive income before reclassifications:
Change in fair value of derivatives	0	0	0	0
Income tax effect	581	(176)	1,767	(176)
Net of tax	581	(176)	1,767	(176)
Amounts reclassified from accumulated other comprehensive loss:
Oil and gas sales	0	0	0	0
Income tax effect	0	0	0	0
Net of tax	0	0	0	0
Net other comprehensive income (loss)	581	(176)	1,767	(176)
Ending balance	0	(176)	0	(176)
Total
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(1,562)	802	(4,750)	947
Amounts reclassified from accumulated other comprehensive loss:
Ending balance	$ 320	$ (473)	$ 320	$ (473)

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

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