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Income Taxes (Tables)
 9 Months Ended
Sep. 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 September 30, 2018 and 2017 due to the following (in thousands):
 
 
2018
 
2017
Computed tax expense at the U.S. federal tax rate
 
$
49,889

 
21.0
 %
 
$
114,626

 
35.0
 %
Changes resulting from:
 
 
 
 
 
 
 
 
Foreign income tax differential
 
2,359

 
1.0
 %
 
(9,247
)
 
(2.8
)%
Excess tax benefits related to stock-based compensation
 
(7,562
)
 
(3.2
)%
 
(4,360
)
 
(1.3
)%
State taxes net of federal benefits
 
3,119

 
1.3
 %
 
5,926

 
1.8
 %
Foreign-sourced nontaxable income
 
(5,620
)
 
(2.4
)%
 
1,558

 
0.5
 %
Foreign withholding taxes1
 
4,578

 
1.9
 %
 
3,065

 
0.9
 %
GILTI tax, net of foreign tax credits
 
5,576

 
2.4
 %
 
—

 
—
 %
Valuation allowance on investment loss
 
—

 
—
 %
 
16,718

 
5.1
 %
Transition tax, net of foreign tax credits
 
22,731

 
9.6
 %
 
—

 
—
 %
Other1
 
4,804

 
2.0
 %
 
(3,607
)
 
(1.1
)%
Provision for income taxes
 
$
79,874

 
33.6
 %
 
$
124,679

 
38.1
 %


1Certain amounts have been reclassified within the schedule above for comparative purposes.