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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]  
Reconciliation between the U.S. federal statutory tax rate and effective tax rate
A reconciliation between the U.S. federal statutory tax rate and our effective tax rate is summarized as follows:
 
For the Three Months
Ended September 30,
 
For the Nine Months
Ended September 30,
 
2015
 
2014
 
2015
 
2014
Statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes
1.2

 
1.2

 
0.5

 
1.2

Taxes on foreign earnings
(10.7
)
 
(9.3
)
 
(10.1
)
 
(8.9
)
Credits and net operating loss utilization
(1.1
)
 
(0.6
)
 
(0.9
)
 
(0.8
)
Purchased intangible assets
1.5

 
0.7

 
1.2

 
1.1

Manufacturing deduction
(2.1
)
 
(2.0
)
 
(2.0
)
 
(1.9
)
Other permanent items
0.5

 
0.4

 
0.6

 
0.4

Other
—

 
(1.2
)
 
0.3

 
(0.3
)
Effective tax rate
24.3
 %
 
24.2
 %
 
24.6
 %
 
25.8
 %