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Income Taxes (Reconciliation Of The U.S. Federal Statutory Income Tax Rate) (Details)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
U.S. federal statutory rate (as a percent) 35.00% 35.00% 35.00%
Increase (decrease) resulting from:      
State and local taxes, net of federal tax benefit (as a percent) (3.60%) (1.00%) (0.50%)
Impact of foreign operations (as a percent) (8.10%) (39.80%) (33.90%)
Reversal of prior years’ indefinite reinvestment assertion (as a percent) 172.10% 0.00% 0.00%
Dividend income from foreign subsidiaries (as a percent) 0.20% 85.50% 13.00%
Change in valuation allowance and related effects (as a percent) (190.70%) (75.30%) (17.80%)
Nondeductible acquisition costs (as a percent) 1.90% 0.10% 0.90%
Nondeductible share-based compensation costs (as a percent) 0.70% 0.90% 2.10%
Deferred tax liability for assets with indefinite useful lives (as a percent) 0.00% (0.50%) 1.70%
US federal R&D credit (as a percent) (10.10%) (0.00%) (0.00%)
Return to accrual (as a percent) (0.50%) (0.90%) (0.50%)
Other (as a percent) 0.90% 0.90% (0.10%)
Effective income tax rate (as a percent) (2.20%) 4.90% (0.10%)