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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 | |
|---|---|---|
|
Mar. 31, 2014
|
Mar. 31, 2013
|
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Net gain (loss) on mark-to-market adjustments | $ (1,639) | $ (1,039) |
| Total loss on derivative instruments | (2,513) | (418) |
|
Natural Gas [Member] | Not Designated as Hedging Instrument [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Net gain (loss) on settlements | (102) | 49 |
| Net gain (loss) on mark-to-market adjustments | (190) | (388) |
| Total loss on derivative instruments | (292) | (339) |
|
Crude Oil [Member] | Not Designated as Hedging Instrument [Member]
|
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Net gain (loss) on settlements | (773) | 573 |
| Net gain (loss) on mark-to-market adjustments | (1,448) | (652) |
| Total loss on derivative instruments | $ (2,221) | $ (79) |