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Additional Balance Sheet Information - Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable, net    
Trade accounts $ 185,594 $ 116,772
Joint interest accounts 1,359 2,013
Income taxes receivable 10,298 4,323
Other accounts 5,335 2,557
Receivables gross current 192,288 121,342
Allowance for doubtful accounts (1,243) (1,113)
Accounts receivable, net 191,045 120,229
Inventories    
Tubular goods and well equipment 11,005 14,685
Natural gas in storage 2,299 2,364
Inventory, net 13,304 17,049
Other assets    
Deferred compensation plan 12,587 12,921
Debt issuance cost 11,403 14,871
Derivative instruments 2,991 0
Other accounts 58 64
Other assets 27,039 27,856
Accounts payable    
Trade accounts 27,355 30,038
Natural gas purchases 2,231 2,231
Royalty and other owners 85,449 75,106
Accrued capital costs 34,647 27,479
Taxes other than income 13,827 14,628
Other accounts 4,902 10,925
Accounts payable current 168,411 160,407
Accrued liabilities    
Employee benefits 14,153 13,870
Taxes other than income 3,829 5,073
Interest payable 27,650 30,222
Asset retirement obligations 2,000 2,000
Other accounts 1,510 3,980
Accrued liabilities 21,492 24,923
Other liabilities    
Deferred compensation plan 24,169 22,371
Other accounts 4,952 3,653
Other liabilities $ 29,121 $ 26,024