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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 | 9 Months Ended | 15 Months Ended | |
|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Unrealized gain (loss), net | $ (1,598) | $ 1,977 | $ 0 | $ 0 |
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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) | (282) | 40 | 177 | 159 |
| Amount of gain (loss) reclassified from OCI into income (effective portion) | 260 | 772 | (361) | 88 |
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Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Unrealized gain (loss), net | (1,598) | 1,977 | 0 | 0 |
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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 | (205) | (536) | 0 | 0 |
| Unrealized gain (loss), net | (205) | (536) | 0 | 0 |
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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 | (1,393) | 2,513 | 0 | 0 |
| Unrealized gain (loss), net | $ (1,393) | $ 2,513 | $ 0 | $ 0 |