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Income Taxes
 3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes
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 March 31, 2017 and 2016 due to the following (in thousands):
 
 
 
2017
 
2016
Computed tax expense at the U.S. federal tax rate
 
$
58,579

 
35.0
 %
 
$
54,919

 
35.0
 %
Changes resulting from:
 
 
 
 
 
 
 
 
Foreign income tax differential
 
(5,843
)
 
(3.5
)%
 
(4,769
)
 
(3.0
)%
Excess tax benefits related to stock-based compensation
 
(8,721
)
 
(5.2
)%
 
(1,118
)
 
(0.7
)%
State taxes net of federal benefits
 
1,607

 
1.0
 %
 
1,832

 
1.1
 %
Foreign-sourced nontaxable income
 
(603
)
 
(0.4
)%
 
(2,178
)
 
(1.4
)%
Other
 
(1,344
)
 
(0.8
)%
 
(2,864
)
 
(1.8
)%
Provision for income taxes
 
$
43,675

 
26.1
 %
 
$
45,822

 
29.2
 %


The adoption of ASU 2016-09, "Compensation-Stock Compensation: Improvements to Employee Share-Based Payment Accounting" resulted in excess tax benefits being recorded as a reduction of income tax expense beginning January 1, 2016, rather than additional paid in capital as discussed in the summary of significant accounting policies footnote.