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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Summary of Effective Income Tax Rates
For the three and nine month periods ended September 30, 2018 and 2017, the Company’s approximate effective tax rates were as follows:
 
 
 
2018
 
2017
Three months ended September 30,
 
21.1%
 
37.5%
Nine months ended September 30,
 
21.5%
 
36.2%