Consolidated Statements of Changes in Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]
Common dividends declared per share (in dollars per share)	$ 0.6375	$ 0.375	$ 0.30
Preferred dividends declared per share (in dollars per share)	$ 0.63	$ 2.00	$ 2.00
Convertible preferred dividends declared per share (in dollars per share)	$ 0	$ 0.075	$ 0
Shares issued in lieu of Directors' fees (in shares)	11,432	26,047	17,636
Issuance of shares pursuant to the TPG Management Services Agreement (in shares)	26,098	18,399	0
Issuance of common stock (in shares)	31,049,976	18,951,700	0
Shares of convertible preferred stock converted to common stock (in shares)	0	13,484,444	0
Issuance of preferred stock (in shares)	0	0	1,046,400
Shares of restricted stock withheld to satisfy tax withholding obligations on vesting of restricted stock (in shares)	3,365	12,169	19,133
Shares of deferred incentive share units withheld to satisfy tax withholding obligations on vesting of DISUs (in shares)	0	0	1,656
Distribution of shares of common stock from deferred compensation plan (in shares)		12,089	51,827
Contribution of shares of common stock to deferred compensation plan (in shares)		3,721	2,061
Issuance of operating partnership units (in shares)	5,351,461	1,800,000	0
Preferred Stock Issued During Period Value New Issues			$ 26,155
Number of share of common stock issued upon redemption of operating partnership units	238,357	1,800,000	0
Limited voting stock, shares issued (in shares)	4,451,461