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Derivative Financial Instruments and Hedging Activities - Schedule of Other Income (Expense), Net Related to Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Losses on economic hedges $ (164) $ (227) $ (875) $ (368)
Write-off of losses in AOCL for a discontinued hedge relationship (5,950) (392) (6,393) (1,171)
Loss on derivatives $ (6,114) $ (619) $ (7,268) $ (1,539)