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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Schedule Of Interest And Penalties
September 30, 2021December 31, 2020
Gross liability for unrecognized tax benefits, exclusive of interest and penalties$16,721 $15,911 
Interest and penalties on unrecognized benefits1,835 2,105 
Total gross uncertain tax positions$18,556 $18,016 
Amount included in Current liabilities$4,497 $6,546 
Amount included in Other long-term liabilities14,059 11,470 
$18,556 $18,016 
Schedule of Effective Income Tax Rate Reconciliation
The effective income tax rate for the three and nine months ended September 30, 2021 and 2020 differs from the federal income tax statutory rate due to the following:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Statutory rate21.0 %21.0 %21.0 %21.0 %
State taxes, net of federal tax benefit2.5 3.3 3.0 3.2 
Foreign tax expense and tax rate differential(0.1)(0.2)(0.1)(0.1)
Tax benefit from stock option exercises(0.6)(0.4)(1.0)(1.0)
Expiration of the statute of limitations— (1.3)— (0.5)
State settlements (0.3)— (0.2)— 
Provision-to-return adjustment(0.5)(0.4)(0.2)(0.1)
Other, net(0.3)(0.6)(0.3)(0.5)
21.7 %21.4 %22.2 %22.0 %