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Fair Value Measurements (Summary of Assets and Liabilities Accounted at Fair Value on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for Sale | $ 0 | $ 239,388
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for Sale | 21,066 | 239,388
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for Sale | 21,066 | 91,595
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for Sale | 0 | 147,793
Recurring | Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Risk management assets - Commodity forward contracts | 451 | 296
Risk management liabilities - Commodity forward contracts | (6,477) | (176)
Recurring | Forward Contracts [Member] | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Risk management assets - Commodity forward contracts | 428 | 48
Risk management liabilities - Commodity forward contracts | (119) | 0
Recurring | Forward Contracts [Member] | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Risk management assets - Commodity forward contracts | 23 | 248
Risk management liabilities - Commodity forward contracts | $ (6,358) | $ (176)

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