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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
Income Taxes [Abstract]      
Statutory U.S. federal income tax rate 21.00% 21.00% 35.00%
State income taxes, net of federal tax benefit 0.20% 0.10% (0.80%)
Tax credits and incentives (9.20%) (8.40%) (4.70%)
Foreign rate differential 2.00% 1.10% (4.50%)
Impact of change in enacted tax law 1.50% (1.30%) (17.20%)
Change in valuation allowances (0.20%) (3.00%) 4.20%
U.S. tax on foreign earnings (4.90%) 1.00%  
Compensation and benefits (0.70%) 1.30% (1.10%)
Other 2.10% 5.40% 3.40%
Effective Income Tax Rate Reconciliation, Percent, Total 11.80% 17.20% 14.30%