v2.4.0.8
Derivative Financial Instruments (Commodity Contracts) (Details) (Commodity Contracts [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Commodity Contracts [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Effective Portion of Cash Flow Hedges Recognized in Other Comprehensive Income (Loss) $ (223,302) $ (21,139)