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Income Taxes Income tax expense (benefit) (Tables)
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of components of income tax expense (benefit)
 
Three months ended March 31,
 
2019
2018
Income tax expense
$
593

$
1,489

Effective tax rate
(8.1
)%
26.6
%