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Additional Balance Sheet Information (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts receivable, net |  |
Trade accounts | $ 183,174 | $ 215,301
Other accounts | 565 | 462
Accounts receivable, gross | 183,739 | 215,763
Allowance for doubtful accounts | (1,039) | (1,039)
Accounts receivable, net | 182,700 | 214,724
Other assets |  |
Deferred compensation plan | 25,820 | 22,510
Debt issuance costs | 5,844 | 6,875
Operating lease right-of-use assets | 32,002 | 33,741
Other accounts | 44 | 85
Other assets | 63,710 | 63,211
Accounts payable |  |
Trade accounts | 18,595 | 12,896
Royalty and other owners | 28,206 | 37,243
Accrued transportation | 47,898 | 52,238
Accrued capital costs | 52,994 | 37,872
Taxes other than income | 8,805 | 13,736
Other accounts | 9,758 | 8,096
Accounts payable | 166,256 | 162,081
Accrued liabilities |  |
Employee benefits | 11,882 | 14,270
Taxes other than income | 2,965 | 3,026
Operating lease liabilities | 3,951 | 3,991
Other accounts | 1,282 | 1,087
Accrued liabilities | 20,080 | 22,374
Other liabilities |  |
Deferred compensation plan | 34,477 | 30,581
Operating lease liabilities | 27,935 | 29,628
Other accounts | 13,509 | 21,069
Other liabilities | $ 75,921 | $ 81,278

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