Exhibit 12.1

STATEMENT OF COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended December 31,
(in thousands)	2008			2009			2010			2011			2012
Computation of Earnings:
Pre-tax earnings from continuing operations, excluding equity in earnings of unconsolidated affiliates	$	187,569		$	206,800		$	209,705		$	223,913		$	263,409
Plus: Fixed charges		11,861			9,822			15,641			17,816			19,691
Plus: Amortization of capitalized interest		12			29			38			22			38
Plus: Distributed earnings from equity investees		—			—			—			800			1,830
Less: Capitalized interest		96			66			54			85			43
Earnings	$	199,346		$	216,585		$	225,330		$	242,466		$	284,925
Fixed Charges:
Interest expense and amortization of deferred financing costs on all indebtedness	$	9,909		$	7,752		$	13,476		$	15,330		$	16,972
Capitalized interest		96			66			54			85			43
Estimate of interest component of rental expenses		1,856			2,004			2,111			2,401			2,676
Fixed charges	$	11,861		$	9,822		$	15,641		$	17,816		$	19,691
Ratio of earnings to fixed charges		16.8	x		22.1	x		14.4	x		13.6	x		14.5	x