Exhibit 12

															Six months ended
															June 30,
	2002			2003			2004			2005		2006			2006			2007
Earnings:
Earnings before income taxes and the cumulative effect of accounting changes	$	213,454		$	209,460		$	215,801		$	206,960	$	203,683		$	91,457		$	79,799
Add: Total fixed charges		108,451			98,117			94,177			95,159		101,184			50,480			51,091
Less: Interest capitalized		573			500			163			167		1,666			446			712
Adjusted earnings	$	321,332		$	307,077		$	309,815		$	301,952	$	303,201		$	141,491		$	130,178
Fixed Charges:
Interest	$	105,359		$	94,110		$	90,327		$	91,171	$	97,320		$	48,538		$	49,111
Portion of rental expense representative of the interest factor (1)		3,092			4,007			3,850			3,988		3,864			1,942			1,980
Total fixed charges	$	108,451		$	98,117		$	94,177		$	95,159	$	101,184		$	50,480		$	51,091
Ratio of Earnings to Fixed Charges		2.96	x		3.13	x		3.29	x		3.17		3.00	x		2.80	x		2.55	x

(1) For purposes of calculating fixed charges, an interest factor of one third was applied to total rent expense for the period indicated.