Exhibit 12.1

Ratio of Earnings to Fixed Charges

and

Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends

	March 31, 2007		2006		2005		2004		2003		2002
Ratio of earnings to fixed charges
Ratio		2.07		1.84		1.83		1.92		1.64		1.42
Income from continuing operations	$	25,553	$	75,514	$	55,693	$	52,007	$	37,194	$	23,543
Interest		23,822		89,979		67,018		55,539		56,109		54,575
“Earnings”	$	49,375	$	165,493	$	122,711	$	107,546	$	93,303	$	78,118
Interest	$	23,822	$	89,979	$	67,018	$	55,539	$	56,109	$	54,575
Capitalized interest		—		—		—		365		768		554
“Fixed charges”	$	23,822	$	89,979	$	67,018	$	55,904	$	56,877	$	55,129
Ratio of earnings to combined fixed charges and preferred stock dividends
Ratio		1.79		1.57		1.48		1.59		1.45		1.24
Income from continuing operations	$	25,553	$	75,514	$	55,693	$	52,007	$	37,194	$	23,543
Interest		23,822		89,979		67,018		55,539		56,109		54,575
“Earnings”	$	49,375	$	165,493	$	122,711	$	107,546	$	93,303	$	78,118
Interest	$	23,822	$	89,979	$	67,018	$	55,539	$	56,109	$	54,575
Capitalized interest		—		—		—		365		768		554
Preferred dividends		3,791		15,163		15,622		11,802		7,677		7,677
“Combined fixed charges and preferred stock dividends”	$	27,613	$	105,142	$	82,640	$	67,706	$	64,554	$	62,806