Real Estate Investments - Discontinued Operations and Assets Held for Sale - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Rental income	$ 104,088	$ 98,740
Expenses
Property operating	37,834	35,406
Other Income (Expense)
Interest and other income, net	113	86
Discontinued Operations
Loss from discontinued operations	(18)	(7)
Gain on sale of properties	5
LOSS FROM DISCONTINUED OPERATIONS	(13)	(7)
Discontinued Operations
Revenues
Rental income	0	0
Revenues	0	0
Expenses
Property operating	18	7
Total Expenses	18	7
Other Income (Expense)
Interest and other income, net	0	0
Total other income (expense)	0	0
Discontinued Operations
Loss from discontinued operations	(18)	(7)
Gain on sale of properties	5	0
LOSS FROM DISCONTINUED OPERATIONS	$ (13)	$ (7)