Condensed Consolidated Statements of Changes in Equity (USD $) In Thousands, unless otherwise specified	Total	Members Equity	Accumulated Other Comprehensive Income (Loss)	Parent	Noncontrolling Interest	Limited Partner Common Stock	Limited Partner Series B Preferred Stock	Limited Partner Series D Preferred Stock	General Partner Common Stock
Beginning Balance at Dec. 31, 2010	$ 432,313	$ 406,863	$ 5,363	$ 412,226	$ 20,087	$ 71,830	$ 194,240	$ 121,892	$ 18,901
Comprehensive (loss) income:
Net (loss) income	(108,956)	(109,394)	0	(109,394)	438	(71,798)	(17,787)	(916)	(18,893)
Change in unrealized gains on investments, net	1,951	0	1,951	1,951	0	0	0	0	0
Total comprehensive (loss) income	(107,005)			(107,443)	438
Contributions from non-controlling interests	3,918	0	0	0	3,918	0	0	0	0
Distributions to non-controlling interests	(90)	0	0	0	(90)	0	0	0	0
Ending Balance at Jun. 30, 2011	329,136	297,469	7,314	304,783	24,353	32	176,453	120,976	8
Beginning Balance at Dec. 31, 2011	328,003	294,511	6,392	300,903	27,100	1	173,555	120,955	0
Comprehensive (loss) income:
Net (loss) income	(12,318)	(12,512)	0	(12,512)	194	0	(12,512)	0	0
Change in unrealized gains on investments, net	802	0	802	802	0	0	0	0	0
Total comprehensive (loss) income	(11,516)			(11,710)	194
Redemption of Company's interest in consolidated joint venture (see Note 13)	(39,819)	(11,580)	0	(11,580)	(28,239)	0	(11,580)	0	0
Contributions from non-controlling interests	1,746	0	0	0	1,746	0	0	0	0
Distributions to non-controlling interests	(345)	0	0	0	(345)	0	0	0	0
Ending Balance at Jun. 30, 2012	$ 278,069	$ 270,419	$ 7,194	$ 277,613	$ 456	$ 1	$ 149,463	$ 120,955	$ 0