Income Taxes (Tables)

9 Months Ended

Sep. 30, 2013

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, 2013 and 2012 due to the following (in thousands):

	2013					2012
Income tax expense at federal statutory rate	$	37,679		35.0	%	$	28,909		35.0	%
Changes resulting from:
Foreign income tax differential		(3,874	)	(3.6	)		(3,030	)	(3.6	)
State taxes, net of federal benefit		1,084		1.0			1,366		1.7
Foreign-sourced nontaxable income		(3,360	)	(3.1	)		(1,826	)	(2.2	)
Other		1,228		1.2			997		1.0
Effect of Statutory Rate Change		(3,722	)	(3.5	)		(3,473	)	(4.1	)
Provision for income taxes	$	29,035		26.9	%	$	22,943		27.8	%