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v3.20.1

Additional Balance Sheet Information (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts receivable, net |  |
Trade accounts | $ 135,862 | $ 209,200
Other accounts | 881 | 1,007
Accounts receivable, gross | 136,743 | 210,207
Allowance for doubtful accounts | (1,046) | (1,184)
Accounts receivable, net | 135,697 | 209,023
Other assets |  |
Deferred compensation plan | 15,784 | 18,381
Debt issuance costs | 8,422 | 8,938
Operating lease right-of-use assets | 35,629 | 35,916
Other accounts | 54 | 56
Other assets | 59,889 | 63,291
Accounts payable |  |
Trade accounts | 25,520 | 21,663
Royalty and other owners | 24,393 | 36,191
Accrued transportation | 51,848 | 55,586
Accrued capital costs | 51,883 | 40,337
Taxes other than income | 20,517 | 16,971
Other accounts | 9,655 | 19,063
Accounts payable | 183,816 | 189,811
Accrued liabilities |  |
Employee benefits | 13,177 | 22,727
Taxes other than income | 3,308 | 3,850
Operating lease liabilities | 3,443 | 3,124
Other accounts | 1,481 | 1,589
Accrued liabilities | 21,409 | 31,290
Other liabilities |  |
Deferred compensation plan | 24,306 | 27,012
Operating lease liabilities | 32,079 | 32,677
Other accounts | 8,691 | 8,595
Other liabilities | $ 65,076 | $ 68,284

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