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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013
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 | $ (3,910) | $ 41,159
Total gains (losses) (realized or unrealized): |  |
Realized and unrealized gains (losses) included in earnings | (77,935) | 13,056
Included in other comprehensive income | (38,412) | 42,719
Settlements | 93,342 | (13,056)
Balance at end of period | (26,915) | 83,878
Change in unrealized gains (losses) relating to the assets and liabilities still held at the end of the period | 15,407 |
Transfers between Level 1 and Level 2 measurements | $ 0 | $ 0

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- Definition Represents the amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to the financial instrument classified as a derivative asset (liability) still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition Represents the amount of transfers of assets or liabilities measured on a recurring basis between Level 1 and Level 2 measurements. + References No definition available. + Details
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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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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) 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)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) 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 + Details
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