Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Schedule of Foreign Exchange Gains Related to Fair of Debt (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]
Foreign exchange gains (losses)	$ (1,464)	$ 663	$ 3,466	$ 808
Tax expense (benefit) on foreign exchange gains (losses)	0	0	0	57
Foreign exchange gains (losses), net of tax	$ (1,464)	$ 663	$ 3,466	$ 751