Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating loss carryforward	$ 17,765	$ 20,874
Stock based compensation	1,973	1,891
Intangibles	304	351
Deferred Tax Assets, Derivative Instruments	0	4,429
Deferred Tax Assets, Interest Expense Limitation	2,254	0
Organizational expenses and other	4,477	2,900
Total deferred tax assets	26,773	30,445
Deferred tax liabilities:
Oil and gas properties and other property and equipment, principally due to intangible drilling costs	(34,332)	(35,214)
Loss on derivative instruments	(4,811)	0
Net deferred tax liabilities	$ (12,370)	$ (4,769)