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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2018
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 21% for 2018 and 35% for 2017 to income before income taxes for the three months ended March 31, 2018 and 2017 due to the following (in thousands):
 
 
2018
 
2017
Computed tax expense at the U.S. federal tax rate
 
$
48,157

 
21.0
 %
 
$
58,579

 
35.0
 %
Changes resulting from:
 
 
 
 
 
 
 
 
Foreign income tax differential
 
2,016

 
0.9
 %
 
(5,843
)
 
(3.5
)%
Excess tax benefits related to stock-based compensation
 
(4,624
)
 
(2.0
)%
 
(8,721
)
 
(5.2
)%
State taxes net of federal benefits
 
3,373

 
1.5
 %
 
1,607

 
1.0
 %
Foreign-sourced nontaxable income
 
(6,588
)
 
(2.9
)%
 
(3,372
)
 
(2.0
)%
Foreign withholding taxes
 
5,471

 
2.4
 %
 
2,045

 
1.2
 %
GILTI Tax, net of foreign tax credits
 
4,921

 
2.1
 %
 
—

 
—
 %
Other
 
1,656

 
0.7
 %
 
(620
)
 
(0.4
)%
Provision for income taxes
 
$
54,382

 
23.7
 %
 
$
43,675

 
26.1
 %