Accumulated Other Comprehensive Income (Schedule of Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Provision for income taxes	$ 99,792	$ 81,006	$ 64,604
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,251	13,983
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	3,200	19,836	2,758
Provision for income taxes	949	5,853	756
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,251	13,983	2,002
Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(421)	(1,042)	(1,064)
Foreign Currency Exchange Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 3,621	$ 20,878	$ 3,822