EXHIBIT 12

STATEMENT REGARDING COMPUTATION OF RATIO OF EARNINGS TO FIXED
CHARGES AND RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED
STOCK DIVIDENDS

	Year Ended December 31
	2001			2002			2003			2004			2005
	(dollars in thousands)
Earnings:
Income from continuing operations before extraordinary items (1)	$	50,853		$	58,312		$	71,779		$	82,099		$	79,154
Fixed charges		34,644			44,644			59,833			76,824			85,999
Capitalized interest		(841	)		(170	)		(1,535	)		(875	)		(665	)
Equity (earnings) losses in less than 50% owned subsidiary		(332	)		(15	)		(270	)
Earnings	$	84,324		$	102,771		$	129,807		$	158,048		$	164,488
Fixed charges:
Interest expense (2)	$	32,028		$	42,101		$	55,377		$	72,556		$	82,624
Capitalized interest		841			170			1,535			875			665
Amortization of loan expenses		1,775			2,373			2,921			3,393			2,710
Fixed charges	$	34,644		$	44,644		$	59,833		$	76,824		$	85,999
Consolidated ratio of earnings to fixed charges		2.43			2.30			2.17			2.06			1.91
Earnings:
Income from continuing operations before extraordinary items (1)	$	50,853		$	58,312		$	71,779		$	82,099		$	79,154
Fixed charges		34,644			44,644			59,833			76,824			85,999
Capitalized interest		(841	)		(170	)		(1,535	)		(875	)		(665	)
Equity (earnings) losses in less than 50% owned subsidiary		(332	)		(15	)		(270	)
Earnings	$	84,324		$	102,771		$	129,807		$	158,048		$	164,488
Fixed charges:
Interest expense (2)	$	32,028		$	42,101		$	55,377		$	72,556		$	82,624
Capitalized interest		841			170			1,535			875			665
Amortization of loan expenses		1,775			2,373			2,921			3,393			2,710
Fixed charges		34,644			44,644			59,833			76,824			85,999
Preferred stock dividends		13,505			12,468			9,218			12,737			21,594
Combined fixed charges and preferred stock dividends	$	48,149		$	57,112		$	69,051		$	89,561		$	107,593
Consolidated ratio of earnings to combined fixed charges and preferred stock dividends		1.75			1.80			1.88			1.76			1.53