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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]  
Summary of Provision for Income Taxes and U.S. Federal Tax Rate
The provision for income taxes differs from amounts computed by applying the U.S. federal tax rate of 35% to income before income taxes for the three months ended June 30, 2016 and 2015 due to the following (in thousands):
 
 
 
2016
 
2015
Computed “expected” tax expense
 
$
56,822

 
35.0
 %
 
$
50,852

 
35.0
 %
Changes resulting from:
 
 
 
 
 
 
 
 
Foreign income tax differential
 
(4,424
)
 
(2.7
)%
 
(5,747
)
 
(4.0
)%
State taxes net of federal benefits
 
1,909

 
1.2
 %
 
2,022

 
1.4
 %
Foreign-sourced nontaxable income
 
(2,020
)
 
(1.2
)%
 
(4,061
)
 
(2.8
)%
Other
 
(4,124
)
 
(2.6
)%
 
3,547

 
2.5
 %
Provision for income taxes
 
$
48,163

 
29.7
 %
 
$
46,613

 
32.1
 %