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Income Taxes Income Taxes (Tables)
6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of effective income tax rate reconciliation
The effective tax rates were as follows:
Three Months Ended
 
Six Months Ended
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
34.5
%
 
8.7
%
 
29.4
%
 
89.9
%