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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of differences between U.S. statutory rate and effective rate
The primary differences between the U.S. statutory rate and our effective rate are as follows: 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
U.S. statutory rate
21.0
 %
 
35.0
 %
 
21.0
 %
 
35.0
 %
Foreign provision
(18.5
)
 
(241.5
)
 
(19.1
)
 
2.8

Change in tax position (1)
—

 
—

 
—

 
(29.3
)
Other
0.5

 
1.6

 
0.9

 
(3.3
)
Effective rate
3.0
 %
 
(204.9
)%
 
2.8
 %
 
5.2
 %

(1)
As a result of a change in tax position related to our foreign taxes, we recorded a tax charge of $6.3 million in June 2017.