Derivative Instruments (Cash Flow Hedges) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 1,463,000	$ 8,062,000	$ 7,936,000
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1,389,000)	(8,302,000)	(8,599,000)
Cash Flow Hedging [Member] | Foreign exchange contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss expected to be reclassified from accumulated OCI into income effective portion over the next year	59,000
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)	(23,000)	346,000	929,000
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0	19,000	(13,000)
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)	1,486,000	7,716,000	7,007,000
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (1,389,000)	$ (8,321,000)	$ (8,586,000)