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Accounts Receivable and Accounts Payable and Accrued Expenses Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | $ 134,124 | $ 322,630
Accrued oil, gas, and NGL production revenue [Member] |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | 58,256 | 180,250
Amounts due From Joint Interest Owners [Member] |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | 22,269 | 58,347
Accrued derivative settlements [Member] |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | 34,579 | 39,811
State severance tax refunds [Member] |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | 12,072 | 24,394
Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | $ 6,948 | $ 19,828

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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