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Additional Balance Sheet Information - Schedule of Additional Balance Sheet Information (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts receivable, net |  |
Trade accounts | $ 115,463 | $ 116,772
Joint interest accounts | 1,517 | 2,013
Other accounts | 2,211 | 2,557
Accounts receivable, net | 119,191 | 121,342
Allowance for doubtful accounts | (1,143) | (1,113)
Accounts receivable, net | 118,048 | 120,229
Inventories |  |
Tubular goods and well equipment | 13,038 | 14,685
Natural gas in storage | 1,947 | 2,364
Inventories | 14,985 | 17,049
Other assets |  |
Deferred compensation plan | 11,760 | 12,921
Debt issuance costs | 13,113 | 14,871
Other accounts | 56 | 64
Other assets | 24,929 | 27,856
Accounts payable |  |
Trade accounts | 23,573 | 30,038
Natural gas purchases | 1,446 | 2,231
Royalty and other owners | 73,153 | 75,106
Accrued capital costs | 30,646 | 27,479
Taxes other than income | 6,078 | 14,628
Other accounts | 7,605 | 10,925
Accounts payable current | 142,501 | 160,407
Accrued liabilities |  |
Employee benefits | 6,670 | 13,870
Taxes other than income | 9,299 | 5,073
Income taxes payable | 380 | 0
Asset retirement obligations | 2,000 | 2,000
Other accounts | 995 | 3,980
Accrued liabilities | 19,344 | 24,923
Other liabilities |  |
Deferred compensation plan | 24,522 | 22,371
Derivative instruments | 994 | 0
Other accounts | 3,928 | 3,653
Other liabilities | $ 29,444 | $ 26,024

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- Definition Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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