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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2015
 
2014
Statutory rate
35.0
 %
 
35.0
 %
State taxes
(0.4
)
 
1.2

Taxes on foreign earnings
(8.4
)
 
(8.4
)
Credits and net operating loss utilization
(0.7
)
 
(1.3
)
Purchased intangible assets
1.0

 
1.5

Manufacturing deduction
(1.6
)
 
(2.0
)
Other permanent items
0.6

 
0.3

Other
0.1

 
0.5

Effective tax rate
25.6
 %
 
26.8
 %