Income Taxes - (Details 3) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Difference in carrying value and tax basis in oil and gas assets	$ 52,790	$ 56,057
Net operating loss	2,032
Share-based compensation	1,052	394
Total deferred tax assets	55,874	56,451
Net deferred tax assets	55,874	56,451
Deferred tax liabilities:
Prepaid Expenses	101	99
Net deferred tax assets	$ 55,773	$ 56,352