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Income Taxes Income tax expense (benefit) (Tables)
6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of components of income tax expense (benefit)
 
Three months ended June 30,
 
Six months ended June 30,
 
2019
2018
 
2019
2018
Income tax (benefit) expense
$
(140
)
$
1,660

 
$
453

$
3,149

Effective tax rate
7.9
%
42.5
%
 
(5.0
)%
33.1
%