Income Taxes (Tables)

3 Months Ended

Mar. 31, 2019

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 2019 and 2018 to income before income taxes for the three months ended March 31, 2019 and 2018 due to the following (in thousands):

	2019					2018
Computed “expected” tax expense	$	48,141		21.0	%	$	48,157		21.0	%
Changes resulting from:
Foreign income tax differential	(4,692		)	(2.0	)%	2,016			0.9	%
Excess tax benefit related to stock-based compensation	(6,385		)	(2.8	)%	(4,624		)	(2.0	)%
State taxes net of federal benefits	3,551			1.5	%	3,373			1.5	%
Foreign-sourced nontaxable income	(56		)	—	%	(6,588		)	(2.9	)%
Foreign withholding	5,275			2.3	%	5,471			2.4	%
GILTI, net of foreign tax credits	2,433			1.1	%	4,921			2.1	%
Change in valuation allowance	3,289			1.4	%	—			—	%
Other	5,578			2.4	%	1,656			0.7	%
Provision for income taxes	$	57,134		24.9	%	$	54,382		23.7	%