Consolidated Statements of Beneficiaries' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Distributions declared per Common Share	$ 0.16	$ 0.15
Cumulative Distributions [Member]
Distributions declared per Common Share	0.16	0.15
Noncontrolling Interest [Member]
Distributions declared per Common Share	$ 0.16	$ 0.15