CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Statement of Stockholders' Equity [Abstract]
Common dividends declared per share (in dollars per share) | $ / shares	$ 0.5625
Issuance of shares to directors (in shares)	15,690
Issuance of shares of common stock upon redemption of Operating Partnership units (in shares)	367,257