CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Common dividends declared per share (in dollars per share)	$ 0.75	$ 0.75	$ 0.6375
Preferred dividends declared per share (in dollars per share)			$ 0.63
Issuance of shares to directors (in shares)	15,690	16,481	11,432
Issuance of shares pursuant to the TPG Management Services Agreement (in shares)		19,122	26,098
Issuance of common stock (in shares)		23,716,900	31,049,976
Buyback of shares to satisfy tax withholding obligation in connection with the vesting of restricted stock (in shares)			3,365
Issuance of Operating Partnership units (in shares)		85,649	5,351,461
Issuance of shares of common stock upon redemption of operating partnership units (in shares)	367,257		238,357
Issuance of shares of limited voting stock (in shares)			4,451,461