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Derivative Financial Instruments (Derivatives And Hedging-Overall-Subsequent Measurement) (Details) (Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | $ 47,982 | $ (2,264) | $ 31,025 | $ 9,018 |
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NYMEX Commodity Contracts [Member] | Sales [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | 47,545 | (2,035) | 33,715 | 8,546 |
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NYMEX Commodity Contracts [Member] | Operating Expenses [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | 4,350 | (3,107) | 447 | (1,645) |
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Butane Futures Agreements [Member] | Cost of Sales [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | $ (3,913) | $ 2,878 | $ (3,137) | $ 2,117 |