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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016 due to the following (in thousands):
 
 
 
2017
 
2016
Computed tax expense at the U.S. federal tax rate
 
$
66,636

 
35.0
 %
 
$
56,822

 
35.0
 %
Changes resulting from:
 
 
 
 
 
 
 
 
Foreign income tax differential
 
(7,473
)
 
(3.9
)%
 
(4,424
)
 
(2.7
)%
Excess tax benefits related to stock-based compensation
 
(803
)
 
(0.4
)%
 
(2,068
)
 
(1.3
)%
State taxes net of federal benefits
 
2,361

 
1.2
 %
 
1,909

 
1.2
 %
Foreign-sourced nontaxable income
 
1,373

 
0.7
 %
 
(2,020
)
 
(1.2
)%
Other
 
(2,692
)
 
(1.4
)%
 
(4,124
)
 
(2.6
)%
Provision for income taxes
 
$
59,402

 
31.2
 %
 
$
46,095

 
28.4
 %