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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy |  |  |
Balance at beginning of period | $ 41,159 | $ 195,127 | $ 14,746
Total gains or (losses) (realized or unrealized): |  |  |
Included in earnings | 52,733 | 224,614 | 85,375
Included in other comprehensive income | (37,249) | (157,478) | 181,346
Settlements | (52,733) | (221,489) | (86,340)
Transfers in and/or out of level 3 |  | 385 |
Balance at end of period | 3,910 | 41,159 | 195,127
Natural Gas Revenues |  |  |
Derivative disclosures |  |  |
Unrealized loss included in natural gas revenues |  | $ (494) | $ (965)

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- Definition Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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