Derivative Financial Instruments Derivatives Not Designated as Hedging Relationships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income (Expense) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 537	$ (3,145)	$ (5,248)
Interest Rate Cap [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments		$ 0	$ 0
Interest Rate Cap [Member] | Interest Expense [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ 129