Equity Investments (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
ASSETS
Cash and cash equivalents	$ 97,682	$ 40,952	$ 45,257	$ 66,493
TOTAL ASSETS	923,163	733,933
LIABILITIES AND MEMBERS CAPITAL
TOTAL LIABILITIES AND EQUITY	923,163	733,933
Real Estate Investment [Member]
ASSETS
Real estate, net	627,362	503,228
Cash and cash equivalents	97,682	40,952
Receivables and other assets	52,680	38,996
Other assets	55,974	31,800
TOTAL ASSETS	755,246	733,933
LIABILITIES AND MEMBERS CAPITAL
Mortgage and notes payable	512,698	340,638
Other current liabilities	21,093	17,274
Other liabilities	65,145	50,970
Non-controlling interests	29,979	13,779
Members' Capital	126,331	157,499
TOTAL LIABILITIES AND EQUITY	755,246	580,160
Carrying value of the Trust's investments in the equity investments	$ 71,069	$ 57,032