Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2011

Net Income Per Common Share [Abstract]

Schedule Of Basic And Diluted Net Income Per Common Share

	Year Ended December 31
	2011			2010			2009
Basic net income per common share
Numerator for basic net income per common share:
Net income	$	160,204		$	126,896		$	129,263
Series A and B preferred share dividends		(20,369	)		(20,233	)		(20,239	)
Unvested stock award participation in earnings		(579	)		(594	)		(554	)
	$	139,256		$	106,069		$	108,470
Denominator for basic net income per common share:
Weighted average common shares outstanding		79,784			69,948			65,418
Average unvested stock awards outstanding		(468	)		(396	)		(373	)
		79,316			69,552			65,045
	$	1.76		$	1.53		$	1.67
Diluted net income per common share
Numerator for diluted net income per common share:
Net income	$	160,204		$	126,896		$	129,263
Dividends on antidilutive convertible preferred shares		(20,071	)		(19,932	)		(19,932	)
Unvested stock award participation in earnings		(579	)		(594	)		(555	)
	$	139,554		$	106,370		$	108,776
Denominator for diluted net income per common share:
Weighted average common shares outstanding		79,784			69,948			65,418
Average unvested stock awards outstanding		(468	)		(396	)		(373	)
Net effect of dilutive stock and option awards		71			39			100
Net effect of dilutive convertible preferred shares		309			310			304
		79,696			69,901			65,449
	$	1.75		$	1.52		$	1.66

Potentially Dilutive Securities Excluded From Computation Of Net Income Per Share

	Year Ended December 31
	2011		2010		2009
Antidilutive convertible preferred shares		16,184		15,819		15,819
Antidilutive equity awards excludable under the treasury stock method:
Shares issuable under option awards		40		40		40
Unvested stock awards		–		240		111