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Fair Value (Schedule Of Carrying Amounts And Fair Values Of Financial Assets/Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | NYMEX Commodity Contracts [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Derivative Asset | $ 27,687 | |
| Derivative liability | (4,502) | |
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Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Debt | (3,261,107) | (2,815,210) |
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Long-term receivables | 30,838 | 2,658 |
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Estimate of Fair Value Measurement [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Long-term receivables | 30,838 | 2,658 |
| Debt | (3,261,107) | (2,815,210) |
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Estimate of Fair Value Measurement [Member] | NYMEX Commodity Contracts [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Derivative Asset | 27,687 | |
| Derivative liability | (4,502) | |
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Reported Value Measurement [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Long-term receivables | 29,815 | 2,730 |
| Debt | (3,003,707) | (2,685,287) |
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Reported Value Measurement [Member] | NYMEX Commodity Contracts [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Derivative Asset | 27,687 | |
| Derivative liability | $ (4,502) |