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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | $ 39,080 |  | $ 68,568 |
Liabilities measured at fair value | 23,655 |  | 54,831 |
Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value |  |  | 27,955 |
Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 27,050 |  | 26,905 |
Liabilities measured at fair value | 14,175 |  | 54,831 |
Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 12,030 |  | 13,708 |
Guarantees |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Liabilities measured at fair value | 9,480 |  |  |
Fair Value Measurements Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 12,030 |  | 41,663 |
Liabilities measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 1 | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 27,955 |
Fair Value Measurements Level 1 | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Liabilities measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 1 | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 12,030 |  | 13,708 |
Fair Value Measurements Level 1 | Guarantees |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Liabilities measured at fair value | 0 |  |  |
Fair Value Measurements Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 30,803 |  | 50,274 |
Liabilities measured at fair value | 17,928 |  | 78,200 |
Fair Value Measurements Level 2 | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value |  |  | 0 |
Fair Value Measurements Level 2 | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 30,803 |  | 50,274 |
Liabilities measured at fair value | 17,928 |  | 78,200 |
Fair Value Measurements Level 2 | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 2 | Guarantees |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Liabilities measured at fair value | 0 |  |  |
Fair Value Measurements Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Liabilities measured at fair value | 9,480 |  | 0 |
Fair Value Measurements Level 3 | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value |  |  | 0 |
Fair Value Measurements Level 3 | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Liabilities measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 3 | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 |  | 0 |
Fair Value Measurements Level 3 | Guarantees |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Liabilities measured at fair value | 9,480 |  |  |
Netting |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | (3,753) | [1] | (23,369) | [1]
Liabilities measured at fair value | (3,753) | [1] | (23,369) | [1]
Netting | Restricted deposits |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value |  |  | 0 | [1]
Netting | Commodity derivative contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | (3,753) | [1] | (23,369) | [1]
Liabilities measured at fair value | (3,753) | [1] | (23,369) | [1]
Netting | Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Assets measured at fair value | 0 | [1] | 0 | [1]
Netting | Guarantees |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Liabilities measured at fair value | $ 0 | [1] |  |
[1] | Represents the impact of netting assets and liabilities with counterparties with which the right of offset exists.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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