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Fair Value Measurements--Changes in Fair Value of Derivatives Classified as Level 3 (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Level 3 Rollforward    
Beginning balance $ 26,231 $ 5,049
Realized and unrealized (losses) gains included in non-hedge derivative (losses) gains (8,725) 31,411
Purchases 664 0
Settlements received (14,548) (10,229)
Ending balance 3,622 26,231
Significant unobservable inputs (Level 3) | Derivative
   
Level 3 Rollforward    
Gains relating to instruments still held at the reporting date included in non-hedge derivative gains for the period $ 3,177 $ 21,534