Other Comprehensive Income (Loss) (Schedule Of Tax Effects Allocated To Each Component Of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation gain (loss), Net-of-Tax Amount	$ 10,340	$ (21,609)	$ 25,474	$ 59,154
Before- Tax Amount	11,111	(8,100)	25,701	45,086
Tax Benefit (Expense)	(280)	(13,656)	(82)	13,061
OTHER COMPREHENSIVE INCOME (LOSS)	10,831	(21,756)	25,619	58,147
Net unrealized gain (loss) on securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Reclassification, Before Tax Amount	771	(234)	227	(1,620)
Before Reclassification, Tax Benefit (Expense)	(280)	87	(82)	613
Before Reclassification, Net-of-Tax Amount	491	(147)	145	(1,007)
Reclassification, Before Tax Amount	0	0	0	0
Reclassification, Tax Benefit (Expense)	0	0	0	0
Reclassification, Net-of-Tax Amount	0	0	0	0
Before- Tax Amount	771	(234)	227	(1,620)
Tax Benefit (Expense)	(280)	87	(82)	613
OTHER COMPREHENSIVE INCOME (LOSS)	491	(147)	145	(1,007)
Foreign currency translation gain (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Reclassification, Before Tax Amount	10,340	(7,866)	25,474	46,706
Before Reclassification, Tax Benefit (Expense)	0	(13,743)	0	12,448
Before Reclassification, Net-of-Tax Amount	10,340	(21,609)	25,474	59,154
Reclassification, Before Tax Amount	0	0	0	0
Reclassification, Tax Benefit (Expense)	0	0	0	0
Reclassification, Net-of-Tax Amount	0	0	0	0
Foreign currency translation gain (loss), Before Tax Amount	10,340	(7,866)	25,474	46,706
Foreign currency translation gain (loss), Tax Benefit (Expense)	0	(13,743)	0	12,448
Foreign currency translation gain (loss), Net-of-Tax Amount	$ 10,340	$ (21,609)	$ 25,474	$ 59,154