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Derivative Financial Instruments (Commodity Contracts) (Details) (Commodity Contracts [Member], USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2014
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Mar. 31, 2013
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Commodity Contracts [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Effective Portion of Cash Flow Hedges Recognized in Other Comprehensive Income (Loss) | $ (223,302) | $ (21,139) |