Shareholders' Equity Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Stockholders' Equity Note [Abstract]

Schedule of Stock by Class

The following series of preferred shares were outstanding as of December 31, 2012 (in thousands, except percentage data):

Description	Shares Outstanding	Dividend Rate		Optional Redemption Date	Liquidation Preference
Series J Preferred	396	6.625	%	August 29, 2008	$99,058
Series K Preferred	598	6.500	%	February 13, 2009	$149,550
Series L Preferred	796	6.600	%	November 30, 2009	$199,075
Series O Preferred	712	8.375	%	February 22, 2013	$177,955