Consolidated Statements of Beneficiaries' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Distributions declared per Common Share	$ 0.54	$ 0.48
Cumulative Distributions [Member]
Distributions declared per Common Share	0.54	0.48
Noncontrolling Interest [Member]
Distributions declared per Common Share	$ 0.54	$ 0.48