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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent      
Federal statutory income tax rate 21.00% 21.00% 35.00%
State income taxes 2.50% 3.00% 2.40%
Federal benefit of state taxes (0.50%) (0.60%) (0.80%)
Foreign rate differential (1.70%) 0.00% (5.10%)
Non-deductible executive compensation 10.60% 0.00% 0.00%
Tax benefit from stock-based compensation (8.10%) (5.20%) (6.70%)
State tax rate adjustment 5.10% 0.00% 0.00%
Foreign-derived intangible income deduction (3.30%) (1.80%) 0.00%
Research and development credit (2.40%) (0.90%) (0.90%)
Unrecognized tax benefits (1.40%) (0.30%) 0.00%
Book basis in excess of tax basis for dispositions 0.00% 3.00% 18.50%
Tax Cuts and Jobs Act of 2017 0 0 (0.731)
Other 2.40% 0.60% (2.20%)
Effective income tax rate 24.20% 18.80% (32.90%)