Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Net operating loss carryforwards	$ 119,900	$ 116,374
Percentage depletion carryover	1,467	1,624
Compensation	13,690	10,574
Lease liabilities	17,107	0
Other	9,099	7,207
Total deferred tax assets	161,263	135,779
Valuation allowance on deferred tax assets	(6,736)	(6,519)
Total deferred tax assets, net of valuation allowance	154,527	129,260
Deferred tax liabilities
Unrealized gain on derivatives	0	12,326
Property and equipment	(151,504)	(100,634)
Less than wholly-owned subsidiaries	(20,604)	(6,808)
Lease right of use assets	(17,107)	0
Other	(2,641)	(2,256)
Total deferred tax liabilities	(191,856)	(122,024)
Net deferred tax (liabilities) assets	$ (37,329)	$ 7,236