Other Comprehensive Income (Schedule Of Tax Effects Allocated To Each Component Of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation, Net-of-Tax Amount	$ 15,134	$ 80,763
Before- Tax Amount	14,590	53,186
Tax Benefit (Expense)	198	26,717
OTHER COMPREHENSIVE INCOME	14,788	79,903
Net unrealized loss on securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Reclassification, Before Tax Amount	(544)	(1,386)
Before Reclassification, Tax Benefit (Expense)	198	526
Before Reclassification, Net-of-Tax Amount	(346)	(860)
Reclassification, Before Tax Amount	0	0
Reclassification, Tax Benefit (Expense)	0	0
Reclassification, Net-of-Tax Amount	0	0
Before- Tax Amount	(544)	(1,386)
Tax Benefit (Expense)	198	526
OTHER COMPREHENSIVE INCOME	(346)	(860)
Foreign currency translation loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Reclassification, Before Tax Amount	15,134	54,572
Before Reclassification, Tax Benefit (Expense)	0	26,191
Before Reclassification, Net-of-Tax Amount	15,134	80,763
Reclassification, Before Tax Amount	0	0
Reclassification, Tax Benefit (Expense)	0	0
Reclassification, Net-of-Tax Amount	0	0
Foreign currency translation, Before Tax Amount	15,134	54,572
Foreign currency translation, Tax Benefit (Expense)	0	26,191
Foreign currency translation, Net-of-Tax Amount	$ 15,134	$ 80,763