Consolidated Statements Of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES
Net (loss) income	$ (16,620,000)	$ 11,945,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Gain on sales		(7,099,000)
Impairment charges	21,396,000
Straight-line rents	(245,000)	(241,000)
Provision for doubtful accounts	502,000	315,000
Depreciation and amortization	10,054,000	10,418,000
Amortization of intangible lease liabilities, net	(669,000)	(639,000)
Expense relating to share-based compensation, net	974,000	933,000
Amortization of deferred financing costs	292,000	359,000
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
Rents and other receivables	(2,831,000)	(3,048,000)
Prepaid expenses and other	(2,656,000)	(1,014,000)
Accounts payable and accrued liabilities	(97,000)	(1,077,000)
Net cash provided by operating activities	10,100,000	10,852,000
INVESTING ACTIVITIES
Acquisitions of real estate		(28,836,000)
Expenditures for real estate improvements	(6,277,000)	(3,235,000)
Net proceeds from sales of real estate		10,372,000
Net cash (used in) investing activities	(6,277,000)	(21,699,000)
FINANCING ACTIVITIES
Repayments under revolving credit facility	(6,500,000)	(18,000,000)
Advances under revolving credit facility	61,000,000	36,000,000
Mortgage repayments	(785,000)	(834,000)
Noncontrolling interests:
Distributions to limited partners	(17,000)	(18,000)
Redemptions of preferred stock	(50,016,000)
Common stock sales less issuance expenses, net	1,000	3,000
Preferred stock dividends	(3,212,000)	(3,602,000)
Distributions to common shareholders	(4,595,000)	(4,271,000)
Net cash (used in) / provided by financing activities	(4,124,000)	9,278,000
Net (decrease) in cash, cash equivalents and restricted cash	(301,000)	(1,569,000)
Cash, cash equivalents and restricted cash at beginning of year	7,219,000	5,762,000
Cash, cash equivalents and restricted cash at end of period	6,918,000	4,193,000
Reconciliation to consolidated balance sheets:
Cash and cash equivalents	3,004,000	2,207,000
Restricted cash	3,914,000	1,986,000
Cash, cash equivalents and restricted cash at end of period	$ 6,918,000	$ 4,193,000