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ADDITIONAL BALANCE SHEET INFORMATION (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Accounts receivable, net |  |
Trade accounts | $ 173,096 | $ 165,070
Joint interest accounts | 5,452 | 5,659
Other accounts | 1,612 | 2,817
Accounts receivable, gross | 180,160 | 173,546
Allowance for doubtful accounts | (1,681) | (1,127)
Accounts receivable, net | 178,479 | 172,419
Inventories |  |
Natural gas in storage | 11,732 | 7,494
Tubular goods and well equipment | 9,136 | 6,392
Other accounts | (29) | 287
Inventory, net | 20,839 | 14,173
Other current assets |  |
Prepaid balances and other | 3,703 | 2,158
Other assets current | 3,703 | 2,158
Other assets |  |
Deferred compensation plan | 11,865 | 10,608
Debt issuance costs | 14,652 | 17,420
Equity method investment | 16,154 | 6,915
Other accounts | 81 | 83
Other assets | 42,752 | 35,026
Accounts payable |  |
Trade accounts | 24,295 | 5,097
Natural gas purchases | 6,389 | 4,892
Royalty and other owners | 75,896 | 66,321
Accrued capital costs | 175,828 | 164,862
Taxes other than income | 10,479 | 19,164
Drilling advances | 35,686 | 44,203
Producer gas imbalances | 1,381 | 1,602
Other accounts | 5,395 | 6,339
Accounts payable current | 335,349 | 312,480
Accrued liabilities |  |
Employee benefits | 32,870 | 16,011
Postretirement benefits | 1,304 | 1,304
Taxes other than income | 10,576 | 8,735
Interest payable | 11,560 | 22,329
Other accounts | 2,924 | 1,410
Accrued liabilities | 59,234 | 49,789
Other liabilities |  |
Deferred compensation plan | 31,800 | 23,893
Other accounts | 11,076 | 16,282
Other liabilities | $ 42,876 | $ 40,175

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable mainly for drilling impact fee and production taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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