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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Losses on economic hedges $ (227) $ 2,742 $ (368) $ (2,429)
Ineffectiveness of cash flow hedges 0 0 0 (657)
Write-off of losses in AOCL for a discontinued hedge relationship (392) (1,654) (1,171) (1,654)
Loss on derivatives $ (619) $ 1,088 $ (1,539) $ (4,740)