Derivative Instruments and Hedging Activities (Derivatives Designated as Hedging Instruments/ Derivatives Not Designated as Hedging Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Derivative Instruments, Gain (Loss) [Line Items] | ||||
Unrealized gain (loss), net | $ 3,505 | $ 0 | $ 3,575 | $ 0 |
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
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Derivative Instruments, Gain (Loss) [Line Items] | ||||
Amount of gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing) | 92 | 59 | 322 | 18 |
Amount of gain (loss) reclassified from OCI into income (effective portion) | 512 | (350) | 512 | (449) |
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
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Derivative Instruments, Gain (Loss) [Line Items] | ||||
Unrealized gain (loss), net | 3,505 | 0 | 3,575 | 0 |
Commodity Contract [Member] | Natural gas [Member] | Not Designated as Hedging Instrument [Member]
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Derivative Instruments, Gain (Loss) [Line Items] | ||||
Realized gain (loss), net | 0 | 0 | 0 | 0 |
Total gain (loss), net | (331) | 0 | (331) | 0 |
Unrealized gain (loss), net | (331) | 0 | (331) | 0 |
Commodity Contract [Member] | Crude Oil [Member] | Not Designated as Hedging Instrument [Member]
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Derivative Instruments, Gain (Loss) [Line Items] | ||||
Realized gain (loss), net | 0 | 0 | 0 | 0 |
Total gain (loss), net | 3,836 | 0 | 3,906 | 0 |
Unrealized gain (loss), net | $ 3,836 | $ 0 | $ 3,906 | $ 0 |