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Income Taxes (Reconciliation of Effective Tax Rate) (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal statutory tax rate | 21.00% | 35.00% | 35.00%
State income taxes, net of federal benefit | 0.80% | (3.20%) | 2.50%
Non-U.S. income taxed at different rates | 0.80% | (4.30%) | (0.60%)
(Increase) decrease in valuation allowance | (3.60%) | 0.10% | (0.20%)
Impact of 2017 Tax Cuts and Jobs Act | 0 | (0.642) | 0
Net operating loss carryback adjustment | 0.00% | 0.00% | (4.70%)
Reduction in tax benefit related to stock-based awards | (1.00%) | (16.90%) | 0.00%
Non-deductible expenditures and goodwill | (9.00%) | (3.90%) | (6.10%)
Research and development credit | 0.30% | 3.60% | 5.70%
Other | (0.40%) | 0.10% | 1.50%
Effective income tax rate | 8.90% | (53.70%) | 33.10%

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