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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]  
Income Tax And Effective Tax Rate
 
Quarter ended
 
Year to date
 
2017
 
2016
 
2017
 
2016
Income tax provision
$
105


$
98

 
$
172


$
180

Effective tax rate
33.8
%
 
27.0
%
 
26.2
%
 
26.8
%