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Income Taxes (Tables)
 9 Months Ended
Sep. 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 September 30, 2017 and 2016 due to the following (in thousands):
 
 
 
2017
 
2016
Computed tax expense at the U.S. federal tax rate
 
$
114,626

 
35.0
 %
 
$
59,571

 
35.0
 %
Changes resulting from:
 
 
 
 
 
 
 
 
Foreign income tax differential
 
(9,247
)
 
(2.8
)%
 
(4,265
)
 
(2.5
)%
Excess tax benefits related to stock-based compensation
 
(4,360
)
 
(1.3
)%
 
(8,247
)
 
(4.9
)%
State taxes net of federal benefits
 
5,926

 
1.8
 %
 
1,678

 
1.0
 %
Foreign-sourced nontaxable income
 
1,558

 
0.5
 %
 
(6,691
)
 
(3.9
)%
Valuation allowance on investment loss
 
16,718

 
5.1
 %
 
960

 
0.6
 %
Other
 
(542
)
 
(0.2
)%
 
(2,420
)
 
(1.4
)%
Provision for income taxes
 
$
124,679

 
38.1
 %
 
$
40,586

 
23.9
 %