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Derivative Financial Instruments (Schedule Of Revenues And Cost Of Goods Sold) (Details) (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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Revenue [Member]
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| Trading Activity, Gains and Losses, Net [Line Items] | ||||
| Net in revenue | $ 962 | $ 7,779 | $ 4,582 | $ 9,762 |
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Cost Of Goods Sold [Member]
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| Trading Activity, Gains and Losses, Net [Line Items] | ||||
| Net in revenue | $ 1,134 | $ 7,636 | $ 5,878 | $ 9,598 |