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Income Taxes (Reconciliation of Effective Tax Rate) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Federal statutory tax rate | 35.00% | 35.00% | 35.00%
State income taxes, net of federal benefit | (14.20%) | (5.30%) | 2.00%
Non-U.S. income taxed at different rates | (11.60%) | 1.20% | (4.40%)
Impact of 2017 Tax Cuts and Jobs Act | (1.736) | 0.000 | 0.000
Net operating loss carryback adjustment | (0.00%) | 10.00% | 1.40%
Reduction in tax benefit related to stock-based awards | (47.20%) | 0.00% | 0.00%
Non-deductible expenditures | (11.00%) | 13.10% | 5.90%
Research and development credit | 10.80% | (12.70%) | (3.50%)
Other | 1.80% | (2.00%) | (3.70%)
Effective income tax rate | (210.00%) | 39.30% | 32.70%

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