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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Federal statutory income tax rate 21.00% 35.00% 35.00%
State income taxes 3.00% 2.40% 2.90%
Federal benefit of state taxes (0.60%) (0.80%) (1.00%)
Foreign rate differential 0.00% (5.10%) (3.10%)
Tax benefit from stock-based compensation (5.20%) (6.70%) 0.00%
Book basis in excess of tax basis for dispositions 3.00% 18.50% 0.00%
Tax Cuts and Jobs Act of 2017 0.00% (73.10%) 0.00%
Foreign-derived intangible income deduction (1.80%) 0.00% 0.00%
Other (0.60%) (3.10%) 1.00%
Effective income tax rate 18.80% (32.90%) 34.80%