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Income Taxes (Tables)
 6 Months Ended
Jun. 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 June 30,
 
For the Six Months
Ended June 30,
 
2018
 
2017
 
2018
 
2017
Statutory rate
21.0
 %
 
35.0
 %
 
21.0
 %
 
35.0
 %
State taxes
0.6

 
0.8

 
0.8

 
0.4

Taxes on foreign earnings
—

 
(11.7
)
 
(0.4
)
 
(11.4
)
Credits and net operating loss utilization
(0.7
)
 
(0.9
)
 
(0.8
)
 
(0.8
)
Purchased intangible assets
0.6

 
1.4

 
0.6

 
1.4

Manufacturing deduction
—

 
(2.1
)
 
—

 
(2.1
)
Other permanent items
0.4

 
0.7

 
0.4

 
0.7

Other
0.5

 
0.6

 
0.3

 
0.8

Effective tax rate
22.4
 %
 
23.8
 %
 
21.9
 %
 
24.0
 %