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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Statutory rate
21.0
 %
 
35.0
 %
 
21.0
 %
 
35.0
 %
State taxes
0.6

 
0.7

 
0.7

 
0.6

Taxes on foreign earnings
0.8

 
(11.4
)
 
0.1

 
(11.4
)
Credits and net operating loss utilization
(1.0
)
 
(0.7
)
 
(0.8
)
 
(0.8
)
Purchased intangible assets
0.3

 
1.2

 
0.5

 
1.3

Manufacturing deduction
—

 
(2.0
)
 
—

 
(2.1
)
Other permanent items
0.3

 
0.6

 
0.3

 
0.7

Tax reform
(0.6
)
 
—

 
(0.3
)
 
—

Other
(1.0
)
 
0.4

 
(0.2
)
 
0.6

Effective tax rate
20.4
 %
 
23.8
 %
 
21.3
 %
 
23.9
 %