Income Taxes (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2013 and 2012 due to the following (in thousands):

	2013					2012
Income tax expense at federal statutory rate	$	31,680		35.0	%	$	21,112		35.0	%
Changes resulting from:
Foreign income tax differential		(3,633	)	(4.0	)		(2,716	)	(4.5	)
State taxes, net of federal benefit		985		1.1			792		1.3
Foreign-sourced nontaxable income		(4,318	)	(4.8	)		(1,894	)	(3.1	)
Other		1,137		1.3			951		1.5
Provision for income taxes and rate	$	25,851		28.6	%	$	18,245		30.2	%