Current income tax expense (benefit) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income from continuing operations.,	$ (10,401)	$ (14,460)	$ (26,645)
Income from discontinued operations.,	10,401	14,460	26,645
Total Current income tax expense (benefit)	0	0	0
Computed "expected" income tax (benefit) expense	(4,211)	(16,008)	(24,627)
Book to tax differences for partnerships not consolidated for tax purposes	(3,831)	(6,442)	(3,636)
Book to tax differences of depreciation and amortization	1,434	1,140	1,544
Book to tax differences in gains on sale of property	(4,835)	(7,020)	6,056
Book provision for loss	1,656	10,132	8,576
Partial valuation allowance against current net operating loss benefit	10,401	14,460	11,324
Other	(614)	3,738	763
Total Federal income tax expense	0	0	0
Alternative Minimum Tax	$ 0	$ 0	$ 0