Accumulated Other Comprehensive Income (Schedule of Reclassifications out of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 1,890	$ 3,625
Provision for income taxes	75,467	82,330	72,668
Reclassifications out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2,569	5,248	(6,830)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1,890	3,625	(4,630)
Provision for income taxes	679	1,623	(2,200)
Interest Rate Swaps [Member] | Reclassifications out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(900)	(690)	(1,424)
Foreign Currency Exchange Contracts [Member] | Reclassifications out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 3,469	$ 5,938	$ (5,406)