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Additional Balance Sheet Information (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts receivable, net |  |
Trade accounts | $ 130,729 | $ 227,835
Joint interest accounts | 1,388 | 2,245
Income taxes receivable | 5,797 | 3,612
Other accounts | 1,440 | 6,515
Accounts receivable, gross | 139,354 | 240,207
Allowance for doubtful accounts | (1,000) | (1,198)
Accounts receivable, net | 138,354 | 239,009
Inventories |  |
Tubular goods and well equipment | 17,750 | 10,675
Natural gas in storage | 2,651 | 3,281
Other accounts | 22 | 70
Inventory, net | 20,423 | 14,026
Other assets |  |
Deferred compensation plan | 13,282 | 13,115
Debt issuance cost | 22,850 | 17,349
Other accounts | 65 | 65
Other assets | 36,197 | 30,529
Accounts payable |  |
Trade accounts | 37,627 | 54,949
Natural gas purchases | 3,138 | 2,407
Royalty and other owners | 75,759 | 97,298
Accrued capital costs | 87,551 | 222,426
Taxes other than income | 8,818 | 16,806
Drilling advances | 81 | 88
Other accounts | 5,659 | 6,102
Accounts payable current | 218,633 | 400,076
Accrued liabilities |  |
Employee benefits | 12,871 | 22,815
Taxes other than income | 11,663 | 7,128
Interest payable | 30,143 | 30,677
Other accounts | 2,788 | 3,049
Accrued liabilities | 57,465 | 63,669
Other liabilities |  |
Deferred compensation plan | 30,130 | 28,932
Other accounts | 4,876 | 10,675
Other liabilities | $ 35,006 | $ 39,607

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