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Derivative Instruments and Hedging Activities (Derivatives Fair Value By Balance Sheet Location) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2014
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Dec. 31, 2013
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|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Asset Fair Value | $ 851 | $ 60 |
| Liability Fair Value | (6,577) | (1,108) |
| Net Derivative Fair Value | (5,726) | (1,048) |
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Not Designated as Hedging Instrument [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Asset Fair Value | 851 | 60 |
| Liability Fair Value | (6,577) | (1,108) |
| Net Derivative Fair Value | (5,726) | (1,048) |
|
Current liabilities - Fair market value of derivatives [Member] | Not Designated as Hedging Instrument [Member] | Natural Gas [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Liability Fair Value | (114) | |
| Net Derivative Fair Value | (114) | |
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Current liabilities - Fair market value of derivatives [Member] | Not Designated as Hedging Instrument [Member] | Crude Oil [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Liability Fair Value | (5,192) | (1,036) |
| Net Derivative Fair Value | (5,192) | (1,036) |
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Non-current liabilities - Other long-term liabilities [Member] | Not Designated as Hedging Instrument [Member] | Natural Gas [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Liability Fair Value | (29) | (72) |
| Net Derivative Fair Value | (29) | (72) |
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Non-current liabilities - Other long-term liabilities [Member] | Not Designated as Hedging Instrument [Member] | Crude Oil [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Liability Fair Value | (1,242) | |
| Net Derivative Fair Value | (1,242) | |
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Current assets - Fair market value of derivatives [Member] | Not Designated as Hedging Instrument [Member] | Natural Gas [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Asset Fair Value | 60 | |
| Net Derivative Fair Value | 60 | |
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Non-current assets - Other long-term assets [Member] | Not Designated as Hedging Instrument [Member] | Crude Oil [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Asset Fair Value | 851 | |
| Net Derivative Fair Value | $ 851 |