CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common dividends declared per share (in dollars per share)	$ 0.2625
Preferred dividends declared per share (in dollars per share)	$ 1.50
Convertible preferred dividends declared per share (in dollars per share)	$ 0.075
Shares issued in lieu of Director's fees (in shares)	26,047
Issuance of shares pursuant to the TPG Management Services Agreement (in shares)	12,864
Issuance of shares of common stock (in shares)	4,300,000
Shares of convertible preferred stock converted to common stock (in shares)	13,484,444
Shares of restricted stock withheld to satisfy tax withholding obligations on vesting of restricted stock (in shares)	12,169
Contribution of shares of common stock to deferred compensation plan (in shares)	3,721
Distribution of shares of common stock from deferred compensation plan (in shares)	2,125
Issuance of operating partnership units (in shares)	1,800,000
Issuance of common stock upon redemption of operating partnership units (in shares)	1,493,297