EXHIBIT 12.1

Ratio of Earnings to Fixed Charges

The following table provides our consolidated ratios of earnings to fixed charges (in thousands except ratios):

	Six Months Ended June 30,		Year Ended December 31,
	2011		2010		2009		2008		2007
Fixed Charges:
Interest expense (1)	$	7,714	$	12,233	$	1,141	$	3,978	$	5,103
Amortized premiums, discounts and capitalized expenses related to indebtedness (2)		584		937		300		280		393
Estimate of the interest within rental expense (3)		8,723		15,957		17,128		17,791		10,921
Total Fixed Charges	$	17,021	$	29,127	$	18,569	$	22,049	$	16,417
Earnings:
Pre-tax income from continuing operations before income or loss from equity investees (4)	$	111,113	$	202,451	$	178,508	$	149,959	$	110,125
Fixed Charges		17,021		29,127		18,569		22,049		16,417
Distributed income of equity investees (4)		0		0		0		0		0
Total Earnings	$	128,134	$	231,578	$	197,077	$	172,008	$	126,542
Ratio of Earnings to Fixed Charges		7.5		8.0		10.6		7.8		7.7

(1) Interest expense consists of interest on indebtedness.

(2) Represents the amortization of financing costs incurred in connection with the Company’s credit agreements.

(3) The proportion of rental expense deemed to be representative of the interest factor is one third.

(4) Equity investees are investments accounted for using the equity method of accounting.