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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2018 and 2017 due to the following (in thousands):
 
 
2018
 
2017
Computed tax expense at the U.S. federal tax rate
 
$
48,547

 
21.0
 %
 
$
66,636

 
35.0
 %
Changes resulting from:
 
 
 
 
 
 
 
 
Foreign income tax differential
 
1,907

 
0.8
 %
 
(7,473
)
 
(3.9
)%
Excess tax benefits related to stock-based compensation
 
(5,946
)
 
(2.6
)%
 
(937
)
 
(0.5
)%
State taxes net of federal benefits
 
3,396

 
1.5
 %
 
2,360

 
1.2
 %
Foreign-sourced nontaxable income
 
(6,291
)
 
(2.7
)%
 
(1,006
)
 
(0.5
)%
Foreign withholding taxes
 
5,426

 
2.4
 %
 
2,381

 
1.3
 %
GILTI Tax, net of foreign tax credits
 
4,921

 
2.1
 %
 
—

 
—
 %
Other
 
2,363

 
1.0
 %
 
(2,559
)
 
(1.4
)%
Provision for income taxes
 
$
54,323

 
23.5
 %
 
$
59,402

 
31.2
 %