Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended						12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Minimum distribution requirement of its real estate investment trust taxable income to its shareholders (in hundredths)							90.00%
Net operating losses (income)							$ 65,522,000	$ 82,393,000	$ 67,909,000
Total income tax expense	$ (375,000)	$ (1,443,000)	$ (3,070,000)	$ (2,401,000)	$ (631,000)	$ (109,000)	(4,888,000)	(3,141,000)	(2,685,000)
Valuation allowance	804,000			$ 804,000			804,000	804,000
Tax Credits							567,000
Dividends, Preferred Stock							17,380,000	$ 14,356,000	$ 14,356,000
Federal [Member]
Segment Reporting Information [Line Items]
Net operating loss carryforwards	46,125,000						46,125,000
State [Member]
Segment Reporting Information [Line Items]
Net operating loss carryforwards	$ 54,281,000						54,281,000
Series E Preferred Shares [Member]
Segment Reporting Information [Line Items]
Dividends, Preferred Stock							$ 0