Derivative Instruments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative [Line Items]
Gain (loss) recognized in income	$ 4,872,000	$ 409,000	$ 4,465,000	$ (1,712,000)
Interest Rate Swap [Member]
Derivative [Line Items]
Gain (loss) recognized in OCI	(4,000)	797,000	(12,000)	2,342,000
Gain (loss) reclassified from AOCI into income	(477,000)	383,000	(1,428,000)	1,204,000
Gain (loss) recognized in income	0	0	0	(96,000)
Foreign Exchange Contract [Member]
Derivative [Line Items]
Gain (loss) recognized in OCI	(110,404,000)	(12,663,000)	(19,867,000)	(5,747,000)
Gain (loss) recognized in income	$ (4,872,000)	$ (409,000)	$ (4,465,000)	$ 1,808,000