Income Taxes (Tables)

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Summary Of The Provision For Income Taxes And The U.S. Federal Tax Rate

	2012					2011
Income tax expense at federal statutory rate	$	21,112		35.0	%	$	16,505		35.0	%
Changes resulting from:
Foreign income tax differential		(2,716	)	(4.5	)		(1,905	)	(4.0	)
State taxes, net of federal benefit		792		1.3			788		1.7
Foreign-sourced nontaxable income		(1,894	)	(3.1	)		(764	)	(1.6	)
Other		951		1.5			199		0.3
Provision for income taxes and rate	$	18,245		30.2	%	$	14,823		31.4	%