CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Dividends and distributions declared, per share	$ 0.50	$ 0.50
Preferred dividends declared, per share	$ 0.8750
Class A Common Shares [Member]
Share class exchanges, common shares	3,150,281
OP Unit exchanges, shares	98,923	2,344,589
Class C Common Shares [Member]
Share class exchanges, common shares		267,300
Class B Common Shares [Member]
Share class surrenders, shares	6,501	154,098