Income Taxes - Schedule of Tax Effects of Significant Portions of the Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Asset retirement obligations	$ 4,923	$ 4,723
Deferred stock-based compensation	7,196	6,718
Derivative fair value loss	5,985	0
Accrued compensation	5,642	4,650
Lease liabilities	27,089	0
Earnings in investment in subsidiary	182	0
Net operating loss carryforward	170,520	299,250
Other	1,910	0
Total deferred tax assets	223,447	315,341
Less: Valuation allowance	(20,382)	(13,862)
Net deferred tax assets	203,065	301,479
Liabilities:
Book basis of oil and natural gas properties in excess of tax basis	(369,474)	(423,102)
Derivative fair value gain	0	(9,450)
Earnings in investment in subsidiary	0	(156)
Lease right-of-use assets	(27,000)	0
Other	0	(294)
Total deferred tax liabilities	(396,474)	(433,002)
Net deferred tax liability	$ (193,409)	$ (131,523)