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Income Taxes Income Taxes (table 2)
3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The provision for income taxes was as follows:
 
Three Months Ended March 31,
 
2018
 
2017
Income tax provision
$
15,420

 
$
12,993

Effective tax rate
28.2
%
 
23.4
%