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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Losses on economic hedges $ (6) $ (103) $ (374) $ (3,822)
Ineffectiveness of cash flow hedges 0 0 0 (657)
Write-off of losses in AOCL for a discontinued hedge relationship (408) (7,780) (1,580) (9,434)
Loss on derivatives $ (414) $ (7,883) $ (1,954) $ (13,913)