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Income Taxes (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
U.S. statutory rate
21.0
 %
 
35.0
 %
 
21.0
 %
 
35.0
 %
Foreign provision
(19.6
)
 
79.7

 
(20.2
)
 
(5.5
)
Change in tax position (1)
—

 
(459.7
)
 
—

 
(28.3
)
Other
0.2

 
(19.0
)
 
1.7

 
(3.1
)
Effective rate
1.6
 %
 
(364.0
)%
 
2.5
 %
 
(1.9
)%

(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.