CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) (Parentheticals) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Stockholders Equity [Abstract]
Dividends and distributions, Per share and unit	$ 0.10	$ 0.095	$ 0.20	$ 0.190