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Derivative Financial Instruments and Hedging Activities - Schedule of Statements of Operations Related to Derivative Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Losses on economic hedges $ (141) $ (5,079)
Ineffectiveness of cash flow hedges 0 (657)
Write-off of losses in AOCL for a discontinued hedge relationship (779) 0
Loss on derivatives $ (920) $ (5,736)