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Fair Value Measurements--Level 3 Rollforward (Details) (Recurring Fair Value Measurements, Significant unobservable inputs (Level 3), Derivative, USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Recurring Fair Value Measurements | Significant unobservable inputs (Level 3) | Derivative
   
Level 3 Rollforward    
Beginning balance $ 3,622 $ 26,231
Realized and unrealized gains (losses) included in non-hedge derivative losses 15,632 (18,198)
Purchases 1,220 664
Settlements paid (received) 11,995 (11,300)
Ending balance 32,469 (2,603)
Gains relating to instruments still held at the reporting date included in non-hedge derivative gains (losses) for the period $ 24,156 $ 8,776