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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule Of Components Of Income Tax Expense
The following table summarizes our provision (benefit) for income taxes and our effective tax rates for the three months ended March 31, 2017 and 2018 (in thousands, except effective tax rate):

 
Three Months Ended March31,
 
2017
 
2018
Loss before benefit for income taxes
(3,836
)
 
(6,536
)
Benefit from income taxes
(4,916
)
 
(1,691
)
Effective tax rate
128.2
%
 
25.9
%