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ADDITIONAL BALANCE SHEET INFORMATION (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Accounts receivable, net |  |
Trade accounts | $ 167,405 | $ 165,070
Joint interest accounts | 4,826 | 5,659
Other accounts | 1,555 | 2,817
Accounts receivable, gross | 173,786 | 173,546
Allowance for doubtful accounts | (1,125) | (1,127)
Accounts receivable, net | 172,661 | 172,419
Inventories |  |
Natural gas in storage | 3,425 | 7,494
Tubular goods and well equipment | 8,011 | 6,392
Other accounts | (158) | 287
Inventory, net | 11,278 | 14,173
Other current assets |  |
Prepaid balances and other | 1,174 | 2,158
Other assets current | 1,174 | 2,158
Other assets |  |
Deferred compensation plan | 11,372 | 10,608
Debt issuance costs | 16,523 | 17,420
Equity method investment | 8,211 | 6,915
Other accounts | 78 | 83
Other assets | 36,184 | 35,026
Accounts payable |  |
Trade accounts | 11,006 | 14,037
Natural gas purchases | 2,331 | 4,892
Royalty and other owners | 71,028 | 66,321
Accrued capital costs | 154,498 | 164,862
Taxes other than income | 13,504 | 10,224
Drilling advances | 40,607 | 44,203
Producer gas imbalances | 1,628 | 1,602
Other accounts | 5,131 | 6,339
Accounts payable current | 299,733 | 312,480
Accrued liabilities |  |
Employee benefits | 17,346 | 16,011
Postretirement benefits | 1,304 | 1,304
Taxes other than income | 8,959 | 8,735
Interest payable | 12,650 | 22,329
Other accounts | 2,294 | 1,218
Accrued liabilities | 42,553 | 49,597
Other liabilities |  |
Deferred compensation plan | 29,429 | 23,893
Other accounts | 12,793 | 16,282
Other liabilities | $ 42,222 | $ 40,175

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