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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule Of Interest And Penalties
March 31, 2021December 31, 2020
Gross liability for unrecognized tax benefits, exclusive of interest and penalties$16,713 $15,911 
Interest and penalties on unrecognized benefits2,248 2,105 
Total gross uncertain tax positions$18,961 $18,016 
Amount included in Current liabilities$6,553 $6,546 
Amount included in Other long-term liabilities12,408 11,470 
$18,961 $18,016 
Schedule of Effective Income Tax Rate Reconciliation
The effective income tax rate for the three months ended March 31, 2021 and 2020 differs from the federal income tax statutory rate due to the following:
Three Months Ended March 31,
20212020
Statutory rate21.0 %21.0 %
State taxes, net of federal tax benefit3.1 3.1 
Foreign tax expense and tax rate differential(0.1)(0.1)
Tax benefit from stock option exercises(1.1)(2.2)
Other, net(0.3)(0.3)
22.6 %21.5 %