Real Estate Held for Sale (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 18, 2015
Discontinued Operations and Real Estate Held for Sale
Contract price				$ 14,300,000
Real Estate Properties [Line Items]
Land and improvements, net	$ 54,759,000	$ 58,936,000
Buildings and improvements, net	149,959,000	132,670,000
Lease intangibles, net	1,182,000	2,248,000
Straight-line rent	300,000	900,000	$ 400,000
Assets associated with real estate held for sale	0	12,679,000
Notes payable	141,882,000	154,460,000
Accrued and other liabilities	25,254,000	25,606,000
Obligations associated with real estate held for sale	0	14,897,000
Disposal Group, Held-for-sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Deferred financing fees	0	(69,000)
Notes payable, net of deferred financing fees	0	14,831,000
Real Estate Held For Sale
Real Estate Properties [Line Items]
Land and improvements, net		2,785,000
Buildings and improvements, net		8,362,000
Lease intangibles, net		668,000
Straight-line rent		864,000
Assets associated with real estate held for sale		12,679,000
Notes payable, net of deferred financing fees		14,831,000
Accrued and other liabilities		66,000
Obligations associated with real estate held for sale		14,897,000
Las Colinas Commons
Real Estate Properties [Line Items]
Net income (loss) attributable to the Company	800,000.0	(300,000.0)	$ (400,000.0)
Loan balance	11,300,000	11,300,000
Las Colinas Commons | Real Estate Held For Sale
Real Estate Properties [Line Items]
Notes payable	14,900,000	14,900,000
Northpoint Central
Real Estate Properties [Line Items]
Notes payable	10,602,000	11,720,000
Excess principal balance	$ 3,600,000	$ 3,600,000