EXHIBIT 12

Computation of Ratio of Earnings to Fixed Charges

($’s in 000’s)

	December 2011		December 2010		December 2009		December 2008		December 2007
Fixed Charges:
Interest charges (per I/S)	$	29,332	$	16,150	$	17,178	$	18,852	$	23,353
Less: net amortization of debt discount and premium and issuance expenses		1,263		547		308		288		460
Adjusted interest charges		28,069		15,603		16,870		18,564		22,893
Add: Net amortization of debt discount and premium and issuance expense		1,263		547		308		288		460
Interest portion of rental charges		6,262		4,587		4,026		4,145		3,820
Total fixed charges	$	35,594	$	20,737	$	21,204	$	22,997	$	27,173
Earnings:
Pre-tax earnings	$	273,881	$	231,874	$	168,827	$	192,227	$	232,876
Interest charges		28,069		15,603		16,870		18,564		22,893
Net amortization of debt discount and premium and issuance expense		1,263		547		308		288		460
Interest portion of rental charges		6,262		4,587		4,026		4,145		3,820
Total earnings	$	309,475	$	252,611	$	190,031	$	215,224	$	260,049
Ratio of earnings to fixed charges		8.7		12.2		9.0		9.4		9.6

Note: Currently amortization of debt discount and premium and issuance expenses are recorded and included within the interest expense line item. The above analysis starts with interest expense per the income statement and then subtracts the amortization figure in order to get to a “true” interest expense amount.