Exhibit 12.1

Ratio of Earnings to Fixed Charges

Amounts in Thousands (except ratios)

	Year Ended December 31,										Six Months Ended June 30, 2010
	2005		2006		2007		2008		2009
Earnings:
Pre-tax income from continuing operations	$	130,742	$	155,278	$	173,886	$	157,318	$	150,634	$	66,670
Less: Income from equity investees		803		1,052		1,230		1,414		1,113		548
Pre-tax income from continuing operations before adjustment for income from equity investees		129,939		154,226		172,656		155,904		149,521		66,122
Add:
Fixed charges		19,083		16,694		16,434		13,259		6,956		2,854
Distributions from equity investees		681		1,095		1,245		1,180		1,337		148
Total Earnings	$	149,703	$	172,015	$	190,335	$	170,343	$	157,814	$	69,124
Fixed Charges:
Interest expense and amortization of loan costs (1), (2)	$	16,401	$	14,948	$	14,816	$	11,150	$	4,693	$	1,470
Rental expense interest component (3)		2,682		1,746		1,618		2,109		2,263		1,384
Total Fixed Charges	$	19,083	$	16,694	$	16,434	$	13,259	$	6,956	$	2,854
Ratio of Earnings to Fixed Charges		7.8		10.3		11.6		12.8		22.7		24.2

(1) Excludes losses recognized on early extinguishment of debt.

(2) The Company records interest expense accrued on uncertain tax positions as a component of income taxes. The Company has excluded these costs from both the earnings and fixed charges calculation.

(3) The Company utilized one-third of rental expenses relating to operating leases as the interest portion which it believes is a reasonable approximation of the interest factor.