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Derivative Instruments and Hedging Activities (Gain or loss on derivative contracts) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Net gain (loss) on fair value adjustments | $ 5,728 | $ (2,929) | ||
| Total gain (loss) on derivative instruments | 9,944 | (3,686) | 2,746 | (2,123) |
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Natural Gas [Member] | Not Designated as Hedging Instrument [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Net gain (loss) on settlements | 35 | (16) | (144) | (123) |
| Net gain (loss) on fair value adjustments | 55 | 81 | (77) | 178 |
| Total gain (loss) on derivative instruments | 90 | 65 | (221) | 55 |
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Crude Oil [Member] | Not Designated as Hedging Instrument [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Net gain (loss) on settlements | (497) | (618) | (2,838) | 804 |
| Net gain (loss) on fair value adjustments | 10,351 | (3,133) | 5,805 | (2,982) |
| Total gain (loss) on derivative instruments | $ 9,854 | $ (3,751) | $ 2,967 | $ (2,178) |