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Additional Balance Sheet Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Accounts receivable, net |  |
Trade accounts | $ 215,361 | $ 165,070
Joint interest accounts | 7,261 | 5,659
Income taxes receivable | 922 |
Other accounts | 746 | 2,817
Accounts receivable, gross | 224,290 | 173,546
Allowance for doubtful accounts | (1,814) | (1,127)
Accounts receivable, net | 222,476 | 172,419
Inventories |  |
Natural gas in storage | 9,056 | 7,494
Tubular goods and well equipment | 8,396 | 6,392
Other accounts | 16 | 287
Inventory, net | 17,468 | 14,173
Other current assets |  |
Prepaid balances and other | 2,587 | 2,158
Other assets current | 2,587 | 2,158
Other assets |  |
Deferred compensation plan | 12,507 | 10,608
Debt issuance costs | 16,476 | 17,420
Equity method investment | 26,892 | 6,915
Other accounts | 79 | 83
Other assets | 55,954 | 35,026
Accounts payable |  |
Trade accounts | 26,023 | 14,037
Natural gas purchases | 2,052 | 4,892
Royalty and other owners | 79,150 | 66,321
Accrued capital costs | 146,899 | 164,862
Taxes other than income | 13,677 | 10,224
Drilling advances | 14,093 | 44,203
Producer gas imbalances | 69 | 1,602
Other accounts | 6,838 | 6,339
Accounts payable current | 288,801 | 312,480
Accrued liabilities |  |
Employee benefits | 43,599 | 17,315
Taxes other than income | 6,894 | 8,735
Interest payable | 20,211 | 22,329
Other accounts | 2,897 | 1,218
Accrued liabilities | 73,601 | 49,597
Other liabilities |  |
Deferred compensation plan | 33,211 | 23,893
Other accounts | 13,043 | 16,282
Other liabilities | $ 46,254 | $ 40,175

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