Earnings Per Unit (EPU)(Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Loss from Continuing Operations	$ (12,753)	$ (3,322)	$ (17,840)	$ (9,146)
Preferred Unit Distributions	(4,798)	(4,947)	(9,560)	(9,874)
Loss from Continuing Operations Available to Unitholders	(17,551)	(8,269)	(27,400)	(19,020)
Income from Discontinued Operations Available to Unitholders	2,409	3,234	8,600	4,657
Net Loss Available to Unitholders	$ (15,142)	$ (5,035)	$ (18,800)	$ (14,363)
Denominator:
Weighted Average Units - Basic and Diluted	93,106	85,029	92,458	80,540
Basic and Diluted EPU:
Loss from Continuing Operations Available to Unitholders	$ (0.19)	$ (0.10)	$ (0.30)	$ (0.24)
Income from Discontinued Operations Available to Unitholders	$ 0.03	$ 0.04	$ 0.09	$ (0.06)
Net Loss Available to Unitholders	$ (0.16)	$ (0.06)	$ (0.20)	$ (0.18)