Quarterly Operating Results (Schedule Of Quarterly Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Operating Results [Abstract]
Revenue	$ 15,278	$ 15,562	$ 14,252	$ 10,361	$ 10,470	$ 13,519	$ 14,155	$ 12,503	$ 55,453	$ 50,647	$ 58,714
Operating expenses	14,040	14,417	12,719	11,001	11,009	12,445	12,508	12,662	52,177	48,624	55,190
Operating income	1,238	1,145	1,533	(640)	(539)	1,074	1,647	(159)	3,276	2,023	3,524
Net gain (loss) on dispositions of assets	2,004	(46)	4,852	(3)	7,318	3,591	8,856	3,367	6,807	23,132	4,798
Equity in earnings (loss) of joint venture	(105)	159	25	111	(190)	(54)			190	(244)
Net gain on derivatives and convertible debt	20	14	227	175	72	26	162	6,117	436	6,377	11,578
Other income (expense), net	(28)	(43)	(39)	(1)	(32)	85	23	(21)	(111)	55	114
Interest expense	(1,706)	(1,405)	(1,092)	(971)	(1,006)	(1,127)	(1,248)	(1,329)	(5,174)	(4,710)	(5,522)
Loss on debt extinguishment	(167)			(800)	(639)	(399)	(976)	(173)	(967)	(2,187)	(213)
Impairment loss, net	(553)	(848)	(479)	(271)	(220)	(343)	(121)	(793)	(2,151)	(1,477)	(3,829)
Earnings from continuing operations before income taxes	703	(1,024)	5,027	(2,400)	4,764	2,853	8,343	7,009	2,306	22,969	10,450
Income tax benefit (expense)	645	(15)	(35)		(125)				595	(125)
Earnings from continuing operations					4,639	2,853	8,343	7,009	2,901	22,844	10,450
Gain from discontinued operations, net of tax								678		678	3,872
Net earnings	1,348	(1,039)	4,992	(2,400)	4,639	2,853	8,343	7,687	2,901	23,522	14,322
(Earning) loss attributable to noncontrolling interest	(10)	7	(67)	50	(99)	(61)	(178)	(389)	(20)	(727)	(1,197)
Net earnings attributable to controlling interests	1,338	(1,032)	4,925	(2,350)	4,540	2,792	8,165	7,298	2,881	22,795	13,125
Dividends declared and undeclared and in kind dividends deemed on preferred stock	(164)	(205)	(271)	(11,603)	(975)	(976)	(1,057)	(17,740)	(12,243)	(20,748)	(3,632)
Net earnings (loss) attributable to common shareholders	$ 1,174	$ (1,237)	$ 4,654	$ (13,953)	$ 3,565	$ 1,816	$ 7,108	$ (10,442)	$ (9,362)	$ 2,047	$ 9,493
Earnings per Share
Continuing operations - Basic					$ 4.68	$ 2.41	$ 9.36	$ (14.63)	$ (1.00)	$ 1.82	$ 8.06
Discontinued operations - Basic								0.91		0.85	4.55
Total - Basic Earnings (Loss) per Share	$ 0.10	$ (0.11)	$ 0.40	$ (4.75)	4.68	2.41	9.36	(13.72)	(1.00)	2.67	12.61
Diluted Earnings Per Share
Continuing operations - Diluted					0.65	0.39	1.17	(14.63)	(1.00)	0.78	(0.98)
Discontinued operations - Diluted								0.91		0.13	$ 0.98
Total - Diluted Earnings (Loss) per Share	$ 0.10	$ (0.11)	$ 0.37	$ (4.75)	$ 0.65	$ 0.39	$ 1.17	$ (13.72)	$ (1.00)	$ 0.91