Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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		$ 591	(990)	$ 5,636
Income tax effect		(220)	0	(329)
Net of tax		371	(990)	5,307
Amounts reclassified from accumulated other comprehensive income:
Oil and gas sales	$ 401	(618)	222	(404)
Income tax effect	0	230	89	150
Net of tax	401	(388)	311	(254)
Net other comprehensive income (loss)	401	(17)	(679)	5,053
Ending balance	(258,565)		(258,565)
Gains and Losses on Cash Flow Hedges
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(610)	320	278	(2,983)
Other comprehensive income before reclassifications:
Change in fair value of cash flow derivatives		591	(990)	5,636
Income tax effect		(220)	238	(2,096)
Net of tax		371	(752)	3,540
Amounts reclassified from accumulated other comprehensive income:
Oil and gas sales	401	(618)	222	(404)
Income tax effect	(96)	230	(53)	150
Net of tax	305	(388)	169	(254)
Net other comprehensive income (loss)	305	(17)	(583)	3,286
Ending balance	(305)	303	(305)	303
Change in Valuation Allowance
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(192)	0	0	(1,767)
Other comprehensive income before reclassifications:
Change in fair value of cash flow derivatives		0	0	0
Income tax effect		0	(238)	1,767
Net of tax		0	(238)	1,767
Amounts reclassified from accumulated other comprehensive income:
Oil and gas sales	0	0	0	0
Income tax effect	96	0	142	0
Net of tax	96	0	142	0
Net other comprehensive income (loss)	96	0	(96)	1,767
Ending balance	(96)	0	(96)	0
Total
Accumulated other Comprehensive Income [Roll Forward]
Beginning balance	(802)	320	278	(4,750)
Amounts reclassified from accumulated other comprehensive income:
Ending balance	$ (401)	$ 303	$ (401)	$ 303

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