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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 | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Unrealized gain (loss), net | $ (2,929) | $ 2,017 | ||
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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) reclassified from OCI into income (effective portion) | 0 | 260 | 0 | 772 |
| Amount of gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing) | 0 | (282) | 0 | 40 |
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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 | (3,686) | (1,598) | (2,123) | 1,977 |
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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 | (16) | 0 | (123) | 0 |
| Total gain (loss), net | 65 | (205) | 55 | (536) |
| Unrealized gain (loss), net | 81 | (205) | 178 | (536) |
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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 | (618) | 0 | 804 | |
| Total gain (loss), net | (3,751) | (1,393) | (2,178) | 2,513 |
| Unrealized gain (loss), net | $ (3,133) | $ (1,393) | $ (2,982) | $ 2,513 |