Income Taxes (Tables)

6 Months Ended

Jun. 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 June 30, 2013 and 2012 due to the following (in thousands):

	2013					2012
Income tax expense at federal statutory rate	$	36,863		35.0	%	$	27,544		35.0	%
Changes resulting from:
Foreign income tax differential		(4,082	)	(3.9	)		(2,155	)	(2.7	)
State taxes, net of federal benefit		1,337		1.3			653		0.8
Foreign-sourced nontaxable income		(2,785	)	(2.6	)		(2,729	)	(3.5	)
Other		892		0.8			982		1.3
Provision for income taxes	$	32,225		30.6	%	$	24,295		30.9	%