Derivative Instruments (Cash Flow Hedges) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 145	$ 1,463	$ 8,062
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	121	(1,389)	(8,302)
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Cost and Sales of Operating Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	145	(23)	346
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	121	0	19
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0	1,486	7,716
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ 0	$ (1,389)	$ (8,321)