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Supplemental Balance Sheet Detail
 6 Months Ended
Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Balance Sheet Detail Supplemental Balance Sheet Detail
The following table summarizes components of selected balance sheet accounts as of the dates presented:
 June 30,December 31,
 20202019
Other current assets:  
Tubular inventory and well materials$2,995  $2,989  
Prepaid expenses1,146  1,469  
 $4,141  $4,458  
Other assets:  
Deferred issuance costs of the Credit Facility, net of amortization$2,693  $3,952  
Right-of-use assets – operating leases2,734  2,740  
Other110  32  
 $5,537  $6,724  
Accounts payable and accrued liabilities:  
Trade accounts payable $10,706  $30,098  
Drilling costs10,888  18,832  
Royalties23,045  44,537  
Production, ad valorem and other taxes4,874  3,244  
Compensation3,309  5,272  
Interest 591  730  
Current operating lease obligations886  847  
Other1,625  2,264  
 $55,924  $105,824  
Other liabilities:  
Asset retirement obligations$5,183  $4,934  
Noncurrent operating lease obligations2,142  2,232  
Defined benefit pension obligations 814  873  
Postretirement health care benefit obligations 371  343  
Other 1,068  —  
 $9,578  $8,382