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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of effective income tax rate and income tax expense (benefit)
The following table summarizes our effective tax rate and income tax (benefit) expense from continuing operations for the three and nine months ended September 30, 2018 and 2017 (in thousands except for percentages):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Effective tax rate
4
%
 
43
%
 
(40
)%
 
41
%
Income tax (benefit) expense
$
(2,352
)
 
$
(115,197
)
 
$
42,204

 
$
(145,317
)