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Fair Value Measurements - Additional Information (Details) (USD $) |  |  | 3 Months Ended |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2013 Commodity derivative contracts | Dec. 31, 2012 Commodity derivative contracts | Mar. 31, 2013 Commodity derivative contracts Fair Value Measurements Level 3 | Mar. 31, 2014 Commodity derivative contracts Fair Value Measurements Level 3 | Mar. 31, 2014 Gulf Properties | Mar. 31, 2014 Fair Value, Measurements, Recurring | Dec. 31, 2013 Fair Value, Measurements, Recurring | Mar. 31, 2014 Fair Value, Measurements, Recurring Fair Value Measurements Level 1 | Dec. 31, 2013 Fair Value, Measurements, Recurring Fair Value Measurements Level 1 | Mar. 31, 2014 Fair Value, Measurements, Recurring Fair Value Measurements Level 3 | Dec. 31, 2013 Fair Value, Measurements, Recurring Fair Value Measurements Level 3 | Mar. 31, 2014 Fair Value, Measurements, Recurring Commodity derivative contracts | Dec. 31, 2013 Fair Value, Measurements, Recurring Commodity derivative contracts | Mar. 31, 2014 Fair Value, Measurements, Recurring Commodity derivative contracts Fair Value Measurements Level 1 | Dec. 31, 2013 Fair Value, Measurements, Recurring Commodity derivative contracts Fair Value Measurements Level 1 | Mar. 31, 2014 Fair Value, Measurements, Recurring Commodity derivative contracts Fair Value Measurements Level 3 | Dec. 31, 2013 Fair Value, Measurements, Recurring Commodity derivative contracts Fair Value Measurements Level 3 | Dec. 31, 2013 Fair Value, Measurements, Recurring Restricted deposits | Mar. 31, 2014 Fair Value, Measurements, Recurring Restricted deposits Fair Value Measurements Level 1 | Dec. 31, 2013 Fair Value, Measurements, Recurring Restricted deposits Fair Value Measurements Level 1 | Dec. 31, 2013 Fair Value, Measurements, Recurring Restricted deposits Fair Value Measurements Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets measured at fair value |  |  |  |  |  | $ 39,080,000 | $ 68,568,000 | $ 12,030,000 | $ 41,663,000 | $ 0 | $ 0 | $ 27,050,000 | $ 26,905,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 27,955,000 | $ 0 | $ 27,955,000 | $ 0
Fair value inputs, probability of default |  |  |  |  | 3.71% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on derivative contracts |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Level 3 outstanding, value | $ 211,000 | $ 512,000 |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability 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 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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