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Fair Value Disclosures (Schedule Of Assets And Liabilities Fair Value) (Details) (USD $)
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Jun. 30, 2014
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Dec. 31, 2013
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||
| Debt instrument amount | $ 22,000,000 | ||||
| Assets | |||||
| Cash and cash equivalents | 333,379,000 | 272,027,000 | |||
| Restricted cash | 41,278,000 | 26,994,000 | |||
| Inventories carried at market | 20,099,000 | 23,782,000 | |||
| Unrealized gains on derivatives | 62,664,000 | 48,636,000 | |||
| Other assets | 119,000 | 2,200,000 | [1] | ||
| Total assets measured at fair value | 457,539,000 | 373,639,000 | |||
| Liabilities | |||||
| Unrealized losses on derivatives | 12,085,000 | 4,612,000 | |||
| Other | 9,000 | ||||
| Total liabilities measured at fair value | 12,085,000 | 4,621,000 | |||
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Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
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| Assets | |||||
| Cash and cash equivalents | 333,379,000 | 272,027,000 | |||
| Restricted cash | 41,278,000 | 26,994,000 | |||
| Margin deposits | 69,387,000 | 77,102,000 | |||
| Unrealized gains on derivatives | 6,914,000 | 3,629,000 | |||
| Other assets | 119,000 | 2,200,000 | [1] | ||
| Total assets measured at fair value | 451,077,000 | 381,952,000 | |||
| Liabilities | |||||
| Unrealized losses on derivatives | 34,820,000 | 50,807,000 | |||
| Other | 9,000 | ||||
| Total liabilities measured at fair value | 34,820,000 | 50,816,000 | |||
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Significant Other Observable Inputs (Level 2) [Member]
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| Assets | |||||
| Inventories carried at market | 20,099,000 | 23,782,000 | |||
| Unrealized gains on derivatives | 29,282,000 | 18,712,000 | |||
| Total assets measured at fair value | 49,381,000 | 42,494,000 | |||
| Liabilities | |||||
| Unrealized losses on derivatives | 20,184,000 | 4,612,000 | |||
| Total liabilities measured at fair value | 20,184,000 | 4,612,000 | |||
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Reclassification For Balance Sheet Presentation [Member]
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| Assets | |||||
| Margin deposits | (69,387,000) | (77,102,000) | |||
| Unrealized gains on derivatives | 26,468,000 | 26,295,000 | |||
| Total assets measured at fair value | (42,919,000) | (50,807,000) | |||
| Liabilities | |||||
| Unrealized losses on derivatives | (42,919,000) | (50,807,000) | |||
| Total liabilities measured at fair value | $ (42,919,000) | $ (50,807,000) | |||
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