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Non-controlling Interests (Details Textual) (USD $)
9 Months Ended 1 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 30, 2011
May 02, 2012
Mar. 29, 2012
Mar. 31, 2012
Deer Valley Operating Property [Member]
Mar. 29, 2012
Deer Valley Operating Property [Member]
Jun. 30, 2012
One East Erie/Ontario Operating Property [Member]
Jan. 06, 2012
One East Erie/Ontario Operating Property [Member]
Non Controlling Interests (Textual) (Abstract)                
Percentage of interest in Concord Debt Holdings LLC     33.33%     3.50%   2.00%
Investment in equity investments $ 47,925,000 $ 67,901,000     $ 400,000   $ 5,850,000  
Purchase price accounting, carrying value of the acquired non-controlling interest           192,000   363,000
Purchase price accounting, reduction in paid-in capital       $ 208,000       $ 5,487,000