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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Reconciliation of effective tax rates
The provision for income taxes differs from the amount computed by applying the U.S. corporate statutory income tax rate to income (loss) before income taxes for the reasons set forth below.
 
Three Months Ended March 31,
 
2019
 
2018
Income taxes at the statutory rate
(21.0
)%
 
(21.0
)%
State taxes, net of federal benefit
(1.4
)
 
(1.5
)
Foreign tax rate differential
(0.4
)
 
11.7

Permanent differences
9.4

 
8.3

Uncertain tax positions
(3.8
)
 
(2.2
)
Valuation allowance
0.8

 
0.8

Return to provision adjustments
0.1

 
(5.4
)
Other
—

 
—

Effective tax rate
(16.3
)%
 
(9.3
)%