Supplementary Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplementary Data [Abstract]
Revenues	$ 13,157	$ 16,902	$ 16,059	$ 11,291	$ 11,993	$ 15,619	$ 14,789	$ 11,381	$ 57,409	$ 53,782	$ 55,733
Expenses	13,117	14,556	13,808	12,480	12,371	15,697	13,418	12,502	53,961	53,988	51,676
Earnings (loss) before net losses on disposition of assets, other income, interest, noncontrolling interest and income tax expense (benefit)	40	2,346	2,251	(1,189)	(378)	(78)	1,371	(1,121)	3,448	(206)	4,057
Net gains (losses) on dispositions of assets	(36)	63	(1)	(25)	(1)	(9)	(8)	(29)	1	(47)	(9)
Derivative gain (loss)	(212)	(4,615)	(11,718)	2,115	5,534	2,674	2,137	(317)	(14,430)	10,028	(247)
Other income (expense)	3	(12)	94	31	23	(3)	(6)	20	116	34	103
Interest	(1,697)	(1,774)	(1,819)	(1,729)	(1,394)	(1,336)	(1,330)	(1,339)	(7,019)	(5,399)	(5,054)
Loss on debt extinguishment	(18)	(37)	(94)	(9)	(89)	(161)	(117)	(91)	(158)	(458)	(138)
Impairment recoveries (losses)	(1,388)	0	0	119	(2,266)	(165)	(7)	0	(1,269)	(2,438)	(97)
Earnings (loss) from continuing operations before income taxes	(3,308)	(4,029)	(11,287)	(687)	1,429	922	2,040	(2,877)	(19,311)	1,514	(1,385)
Income tax (benefit) expense	0	0	0	0	0	0	0	0	0	0	6,552
Earnings (loss) from continuing operations	(3,308)	(4,029)	(11,287)	(687)	1,429	922	2,040	(2,877)	(19,311)	1,514	(7,937)
Discontinued operations	413	1,628	829	182	(2,794)	777	338	(1,188)	3,052	(2,867)	(2,283)
Net earnings (loss)	(2,895)	(2,401)	(10,458)	(505)	(1,365)	1,699	2,378	(4,065)	(16,259)	(1,353)	(10,220)
Noncontrolling interest	4	3	15	1	2	(3)	(4)	7	23	2	10
Loss attributable to controlling interests	(2,891)	(2,398)	(10,443)	(504)	(1,363)	1,696	2,374	(4,058)	(16,236)	(1,351)	(10,210)
Preferred stock dividend declared and undeclared	(879)	(868)	(858)	(847)	(838)	(837)	(837)	(837)	(3,452)	(3,349)
Net loss attributable to common shareholders	$ (3,770)	$ (3,266)	$ (11,301)	$ (1,351)	$ (2,201)	$ 859	$ 1,537	$ (4,895)	$ (19,688)	$ (4,700)	$ (13,379)
EPS from continuing operations	$ (0.89)	$ (1.04)	$ (3.69)	$ (0.53)	$ 0.21	$ 0.03	$ 0.41	$ (1.29)	$ (5.84)	$ (0.64)	$ (3.85)
EPS from discontinued operations	$ 0.09	$ 0.35	$ 0.25	$ 0.06	$ (0.97)	$ 0.27	$ 0.12	$ (0.41)	$ 0.79	$ (0.99)	$ (0.79)
EPS Basic and Diluted	$ (0.80)	$ (0.69)	$ (3.44)	$ (0.47)	$ (0.76)	$ 0.30	$ 0.53	$ (1.70)	$ (5.05)	$ (1.63)	$ (4.64)