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Income Taxes (Effective Income Tax Rate Reconciliation) (Details)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]    
Statutory rate 21.00% 21.00%
State taxes, net of federal tax benefit 3.10% 3.10%
Foreign tax expense and tax rate differential (0.10%) (0.10%)
Tax benefit from stock option exercises (1.10%) (2.20%)
Other, net (0.30%) (0.30%)
Effective income tax rate 22.60% 21.50%