Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Prepaid and other current assets:
Inventories 1	$ 7,023	$ 4,274
Prepaid expenses 2	5,737	14,771
Other Assets, Current	12,760	19,045
Other assets:
Deferred issuance costs of the Revolver	2,336	2,349
Operating Lease, Right-of-Use Asset	2,096	2,432
Other	946	127
Other assets	5,378	4,908
Accounts payable and accrued liabilities:
Trade accounts payable	30,701	7,055
Drilling and other lease operating costs	31,892	16,088
Royalties	46,123	26,615
Production, ad valorem and other taxes	6,994	3,094
Derivative Liability Settlements to Counterparties	11,943	321
Compensation	3,270	4,222
Interest	386	504
Operating Lease, Liability, Current	959	936
Other	883	4,254
Accounts payable and accrued liabilities	133,151	63,089
Other non-current liabilities:
Asset retirement obligations	5,809	5,461
Non-current operating lease obligations	1,363	1,752
Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent	1,114	1,149
Other Liabilities, Noncurrent	8,286	8,362
Tubular Inventory and Well Materials	6,700	3,900
Capitalized Costs - Crude Oil in Storage	300	400
Drilling and Completion Prepayment	$ 3,600	13,600
Accrued Expenses - Juniper Transaction		$ 3,500