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Derivatives (Realized and Unrealized Gains (Losses)) (Details) (Commodity derivatives [Member], USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Derivatives, Fair Value [Line Items] | |||
| Gain (loss) on derivatives, realized | $ (733) | $ 200 | $ 2,408 |
| Gain (loss) on derivatives, unrealized | 595 | (1,495) | 992 |
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Gain (Loss) on Derivative Instruments [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Gain (loss) on derivatives, realized | 735 | 1,069 | 2,408 |
| Gain (loss) on derivatives, unrealized | 356 | (1,041) | 992 |
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Interest Expense [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Gain (loss) on derivatives, realized | (433) | (207) | |
| Gain (loss) on derivatives, unrealized | 239 | (454) | |
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Other Income [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Gain (loss) on derivatives, realized | (1,035) | (662) | |
| Gain (loss) on derivatives, unrealized | $ 0 | $ 0 | |