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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 | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | $ (20,289) | $ 15,710 | $ (16,957) | $ 11,282 |
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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 | (16,653) | 12,342 | (13,830) | 10,581 |
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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 | (4,268) | 3,348 | (3,903) | 1,462 |
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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 | $ 632 | $ 20 | $ 776 | $ (761) |