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Additional Balance Sheet Information - Certain Balance Sheet Amounts (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts receivable, net    
Trade accounts $ 209,200 $ 362,973
Other accounts 1,007 668
Receivables gross current 210,207 363,641
Allowance for doubtful accounts (1,184) (1,238)
Accounts receivable, net 209,023 362,403
Other assets    
Deferred compensation plan 18,381 14,699
Debt issuance cost 8,938 4,572
Income taxes receivable 0 8,165
Operating lease right-of-use assets 35,916  
Other accounts 56 61
Other assets 63,291 27,497
Accounts payable    
Trade accounts 21,663 30,033
Royalty and other owners 36,191 61,507
Accrued transportation 55,586 50,540
Accrued capital costs 40,337 43,207
Taxes other than income 16,971 19,824
Income taxes payable 0 1,134
Other accounts 19,063 35,694
Accounts payable current 189,811 241,939
Accrued liabilities    
Employee benefits 22,727 21,761
Taxes other than income 3,850 1,472
Operating lease liabilities 3,124  
Other accounts 1,589 1,994
Accrued liabilities 31,290 25,227
Other liabilities    
Deferred compensation plan 27,012 25,780
Operating lease liabilities 32,677  
Other accounts 8,595 34,391
Other liabilities $ 68,284 $ 60,171