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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
 
 
 
 
 
 
 
 
U.S. statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
Foreign provision
(10.8
)
 
(35.3
)
 
(8.8
)
 
(32.9
)
Other
(0.1
)
 
1.2

 
0.5

 
1.9

Effective rate
24.1
 %
 
0.9
 %
 
26.7
 %
 
4.0
 %