Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	$ (251,808)	$ (248,935)
Other comprehensive income before reclassifications:
Change in fair value of cash flow derivatives	(445)	(990)
Income tax effect	0	0
Net of tax	(445)	(990)
Amounts reclassified from accumulated other comprehensive income:
Oil and gas sales	361	(179)
Income tax effect	0	89
Net of tax	361	(90)
Net other comprehensive income (loss)	(84)	(1,080)
Ending balance	(254,247)	(254,247)
Gains and Losses on Cash Flow Hedges
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(546)
Other comprehensive income before reclassifications:
Change in fair value of cash flow derivatives	(445)
Income tax effect	107
Net of tax	(338)
Amounts reclassified from accumulated other comprehensive income:
Oil and gas sales	361
Income tax effect	(87)
Net of tax	274
Net other comprehensive income (loss)	(64)
Ending balance	(610)	(610)
Gains and Losses on Cash Flow Hedges
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance		278
Other comprehensive income before reclassifications:
Change in fair value of cash flow derivatives		(990)
Income tax effect		238
Net of tax		(752)
Amounts reclassified from accumulated other comprehensive income:
Oil and gas sales		(179)
Income tax effect		43
Net of tax		(136)
Net other comprehensive income (loss)		(888)
Ending balance	(610)	(610)
Change in Valuation Allowance
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(172)	0
Other comprehensive income before reclassifications:
Change in fair value of cash flow derivatives	0	0
Income tax effect	(107)	(238)
Net of tax	(107)	(238)
Amounts reclassified from accumulated other comprehensive income:
Oil and gas sales	0	0
Income tax effect	87	46
Net of tax	87	46
Net other comprehensive income (loss)	(20)	(192)
Ending balance	(192)	(192)
Total
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(718)	278
Amounts reclassified from accumulated other comprehensive income:
Ending balance	$ (802)	$ (802)

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