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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2014
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 June 30,
 
For the Six Months
Ended June 30,
 
2014
 
2013
 
2014
 
2013
Statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes
1.1

 
1.9

 
1.1

 
4.4

Taxes on foreign earnings
(8.7
)
 
(7.2
)
 
(8.5
)
 
(8.4
)
Credits and net operating loss utilization
(0.7
)
 
(3.5
)
 
(0.9
)
 
(3.4
)
Purchased intangible assets
1.2

 
1.8

 
1.3

 
1.5

Manufacturing deduction
(1.7
)
 
(2.4
)
 
(1.8
)
 
(11.1
)
Other permanent items
0.4

 
(1.0
)
 
0.4

 
1.8

Other
0.4

 
(0.2
)
 
0.3

 
(0.2
)
Effective tax rate
27.0
 %
 
24.4
 %
 
26.9
 %
 
19.6
 %