Quarterly Operating Results (Schedule Of Quarterly Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Operating Results [Abstract]
Revenue	$ 15,082	$ 15,462	$ 17,834	$ 16,679	$ 15,278	$ 15,562	$ 14,252	$ 10,361	$ 65,057	$ 55,453	$ 50,647
Operating expenses	13,202	14,266	14,876	14,561	14,040	14,417	12,719	11,001	56,905	52,177	48,624
Operating income	1,880	1,196	2,958	2,118	1,238	1,145	1,533	(640)	8,152	3,276	2,023
Net gain (loss) on dispositions of assets	(17)	3,716	1,895	(24)	2,004	(46)	4,852	(3)	5,570	6,807	23,132
Equity in earnings (loss) of joint venture	(469)	(41)	63	229	(105)	159	25	111	(218)	190	(244)
Net gain on derivatives and convertible debt	(402)	116	156	447	20	14	227	175	317	436	6,377
Other income (expense), net	(26)	(23)	(20)	(14)	(28)	(43)	(39)	(1)	(83)	(111)	55
Interest expense	(2,153)	(2,154)	(2,091)	(1,928)	(1,706)	(1,405)	(1,092)	(971)	(8,326)	(5,174)	(4,710)
Loss on debt extinguishment					(167)			(800)		(967)	(2,187)
Impairment recovery (loss), net				93	(553)	(848)	(479)	(271)	93	(2,151)	(1,477)
Earnings from continuing operations before income taxes	(1,187)	2,810	2,961	921	703	(1,024)	5,027	(2,400)	5,505	2,306	22,969
Income tax benefit (expense)	(20)	(132)	(54)	(129)	645	(15)	(35)		(335)	595	(125)
Net earnings	(1,207)	2,678	2,907	792	1,348	(1,039)	4,992	(2,400)	5,170	2,901	23,522
(Earning) loss attributable to noncontrolling interest	242	(20)	(21)	(6)	(10)	7	(67)	50	195	(20)	(727)
Net earnings attributable to controlling interests	(965)	2,658	2,886	786	1,338	(1,032)	4,925	(2,350)	5,365	2,881	22,795
Dividends declared and undeclared and in kind dividends deemed on preferred stock	(144)	(145)	(145)	(144)	(164)	(205)	(271)	(11,603)	(578)	(12,243)	(20,748)
Net earnings (loss) attributable to common shareholders	$ (1,109)	$ 2,513	$ 2,741	$ 642	$ 1,174	$ (1,237)	$ 4,654	$ (13,953)	$ 4,787	$ (9,362)	$ 2,047
Earnings (loss) per Share
Total - Basic Earnings (Loss) per Share	$ (0.10)	$ 0.21	$ 0.23	$ 0.05	$ 0.10	$ (0.11)	$ 0.40	$ (4.75)	$ 0.40	$ (1.00)	$ 2.67
Total - Diluted Earnings (Loss) per Share	$ (0.10)	$ 0.21	$ 0.23	$ 0.05	$ 0.10	$ (0.11)	$ 0.37	$ (4.75)	$ 0.40	$ (1.00)	$ 0.91