Components of Selected Balance Sheet Accounts (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other current assets:
Tubular inventory and well materials	$ 2,959	$ 2,989
Prepaid expenses	1,806	1,469
Other Assets, Current	4,765	4,458
Other assets:
Deferred issuance costs of the Revolver	3,725	3,952
Operating Lease, Right-of-Use Asset	2,928	2,740
Other	111	32
Other assets	6,764	6,724
Accounts payable and accrued liabilities:
Trade accounts payable	44,482	30,098
Drilling costs	23,260	18,832
Royalties	29,317	44,537
Production, ad valorem and other taxes	3,444	3,244
Compensation	2,246	5,272
Interest	644	730
Operating Lease, Liability, Current	927	847
Other	1,543	2,264
Accounts payable and accrued liabilities	105,863	105,824
Other liabilities:
Asset retirement obligations	5,082	4,934
Operating Lease, Liability, Noncurrent	2,335	2,232
Defined benefit pension obligations	843	873
Postretirement health care benefit obligations	356	343
Other liabilities	$ 8,616	$ 8,382