CONSOLIDATED STATEMENT OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Common Stock USD ($)	Additional Paid In Capital USD ($)	Retained Earnings USD ($)	Cumulative Dividends USD ($)	Accumulated Other Comprehensive Loss USD ($)	Non-Controlling Interest in Consolidated Joint Ventures USD ($)	Preferred Stock, Series A	Preferred Stock, Series A Preferred Stock USD ($)	Preferred Stock, Series D Preferred Stock USD ($)
Balance at Dec. 31, 2012	$ 1,519,313	$ 1,352	$ 1,493,397	$ 158,376	$ (475,144)	$ (5,335)	$ 55,417		$ 176,250	$ 115,000
Balance (in shares) at Dec. 31, 2012		135,237,438							7,050,000	4,600,000
Increase (Decrease) in Stockholders' Equity
Net proceeds from sale of common stock	294,875	253	294,622
Net proceeds from sale of common stock (in shares)		25,300,000
Vesting of restricted common stock	3,871	4	3,867
Vesting of restricted common stock (in shares)		318,512
Redemption of Series A and Series C preferred stock	(176,250)		4,770		(4,770)				(176,250)
Redemption of Series A and Series C preferred stock (in shares)								(7,050,000)	(7,050,000)
Distributions to non-controlling interest	(2,972)						(2,972)
Common stock dividends payable at $0.05 per share year-to-date	(8,144)				(8,144)
Series A preferred dividends at $0.50 per share through redemption date	(2,350)				(2,350)
Series C preferred dividends at $0.786 per share through redemption date	(2,693)				(2,693)
Series D preferred dividends and dividends payable at $1.50 per share year-to-date	(6,900)				(6,900)
Net income	64,752			61,461			3,291
Pension liability adjustment	5,335					5,335
Balance at Sep. 30, 2013	$ 1,688,837	$ 1,609	$ 1,796,656	$ 219,837	$ (500,001)		$ 55,736			$ 115,000
Balance (in shares) at Sep. 30, 2013		160,855,950								4,600,000