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Income Taxes (Effective Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Percentages      
U.S. statutory rate 35.00% 35.00% 35.00%
Foreign tax rate differences (21.00%) (22.30%) (28.80%)
Unremitted earnings 0.00% 0.00% 0.00%
State taxes, net of federal benefit 1.20% 1.00% 0.60%
Change in valuation allowance 2.00% 0.20% 1.20%
Acquisition related differences 4.50% (0.30%) 3.70%
Changes in uncertain tax positions (0.50%) (0.40%) 0.80%
Other (0.40%) 0.90% 0.40%
Effective income tax rate 20.80% 14.10% 12.90%
Swiss Federal Tax Administration FTA      
Operating Loss Carryforwards [Line Items]      
Maximum statutory Swiss income tax rate (as a percent) 17.00% 18.40% 19.70%
Reduction in effective tax rates due to difference between maximum statutory Swiss income tax rate and the company's Swiss income tax rate under the tax holiday (as a percent) 25.70% 18.00% 25.10%