Summary of Significant Accounting Policies Net Income Per BUC (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									$ 4,996,038	$ (1,673,163)	$ (604,191)
Net Income (Loss) Allocated to General Partners									691,312	152,359	28,532
Unallocated loss of Consolidated VIEs									(1,522,846)	(1,289,539)	(2,466,260)
Net (income) loss attributable to noncontrolling interest									549,194	570,759	(203,831)
Net Income (Loss) Allocated to Limited Partners									5,278,378	(1,106,742)	2,037,368
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									2,232,276	752,192	(469,518)
Weighted average number of units outstanding, basic and diluted									37,367,600	30,122,928	27,493,449
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ 0.04	$ 0.03	$ 0.00	$ 0.02	$ (0.10)	$ 0.01	$ (0.01)	$ 0.04	$ 0.09	$ (0.06)	$ 0.09
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic and Diluted Share	$ 0.00	$ 0.03	$ 0.01	$ 0.01	$ 0	$ 0	$ 0.01	$ 0.01	$ 0.05	$ 0.02	$ (0.02)
Earnings Per Share, Basic and Diluted	$ 0.04	$ 0.06	$ 0.01	$ 0.03	$ (0.10)	$ 0.01	$ 0	$ 0.05	$ 0.14	$ (0.04)	$ 0.07
Segment, Continuing Operations [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									2,763,762	(2,425,355)	(134,673)
Net Income (Loss) Allocated to General Partners									331,403	144,837	33,227
Unallocated loss of Consolidated VIEs									(1,522,846)	(1,289,539)	(2,466,260)
Net (income) loss attributable to noncontrolling interest									549,194	570,759	(203,831)
Net Income (Loss) Allocated to Limited Partners									3,406,011	(1,851,412)	2,502,191
Segment, Discontinued Operations [Member]
Net Income (Loss) Allocated to General Partners									359,909	7,522	(4,695)
Unallocated loss of Consolidated VIEs									0	0	0
Net Income (Loss) Allocated to Limited Partners									1,872,367	744,670	(464,823)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									$ 2,232,276	$ 752,192	$ (469,518)