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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of Reconciliation of the U.S. Federal Statutory Rate to Effective Tax Rate

A reconciliation of the U.S. federal statutory income tax rate to our effective income tax rate is as follows:
 
For the Three Months Ended 
 June 30,
 
For the Six Months Ended 
 June 30,
 
2019
 
2018
 
2019
 
2018
U.S. federal statutory income tax rate
21.0
 %
 
21.0
%
 
21.0
 %
 
21.0
 %
    State income taxes
2.7
 %
 
2.5
%
 
2.8
 %
 
2.5
 %
Excess tax benefits from stock-based compensation plans
 %
 
%
 
-1.9
 %
 
-0.1
 %
    Other
-0.1
 %
 
0.2
%
 
0.1
 %
 
0.4
 %
Effective income tax rate
23.6
 %
 
23.7
%
 
22.0
 %
 
23.8
 %