Income Taxes (Tables)

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Summary Of Company's Income Tax Provision And Effective Income Tax Rate

	Three Months Ended March 31,
	2012			2011
Income before income taxes	$	77,181		$	82,438
Provision for income taxes	$	22,066		$	22,539
Effective income tax rate		28.6	%		27.3	%