Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance			$ (248,935)
Other comprehensive income before reclassifications:
Change in fair value of cash flow derivatives	$ (445)	$ 2,179	(990)	$ 5,045
Income tax effect	0	(229)	0	(109)
Net of tax	(445)	1,950	(990)	4,936
Amounts reclassified from accumulated other comprehensive loss:
Oil and gas sales	307	(108)	(233)	214
Income tax effect	0	40	89	(80)
Net of tax	307	(68)	(144)	134
Derivatives expense	54		54
Income tax effect	0		0
Net of tax	54		54
Net other comprehensive income (loss)	(84)	1,882	(1,080)	5,070
Ending balance	(254,247)		(254,247)
Gains and Losses on Cash Flow Hedges
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(546)	(981)	278	(2,983)
Other comprehensive income before reclassifications:
Change in fair value of cash flow derivatives	(445)	2,179	(990)	5,045
Income tax effect	107	(810)	238	(1,876)
Net of tax	(338)	1,369	(752)	3,169
Amounts reclassified from accumulated other comprehensive loss:
Oil and gas sales	307	(108)	(233)	214
Income tax effect	(74)	40	56	(80)
Net of tax	233	(68)	(177)	134
Derivatives expense	54		54
Income tax effect	(13)		(13)
Net of tax	41		41
Net other comprehensive income (loss)	(64)	1,301	(888)	3,303
Ending balance	(610)	320	(610)	320
Change in Valuation Allowance
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(172)	(581)		(1,767)
Other comprehensive income before reclassifications:
Change in fair value of cash flow derivatives	0	0	0	0
Income tax effect	(107)	581	(238)	1,767
Net of tax	(107)	581	(238)	1,767
Amounts reclassified from accumulated other comprehensive loss:
Oil and gas sales	0	0	0	0
Income tax effect	74	0	33	0
Net of tax	74	0	33	0
Derivatives expense	0		0
Income tax effect	13		13
Net of tax	13		13
Net other comprehensive income (loss)	(20)	581	(192)	1,767
Ending balance	(192)	0	(192)	0
Total
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(718)	(1,562)	278	(4,750)
Amounts reclassified from accumulated other comprehensive loss:
Ending balance	$ (802)	$ 320	$ (802)	$ 320

Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]

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OCI, Before Reclassifications, Tax, Attributable To Parent

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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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