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Other Related Party Transactions (Details) (USD $)
3 Months Ended 9 Months Ended
Dec. 31, 2011
Sep. 30, 2012
Acquisition Partnerships and related parties
Sep. 30, 2011
Acquisition Partnerships and related parties
Sep. 30, 2012
Acquisition Partnerships and related parties
Sep. 30, 2011
Acquisition Partnerships and related parties
Sep. 30, 2012
Mexican subsidiaries
entity
Dec. 31, 2011
Mexican subsidiaries
Other related party transactions              
Servicing fees and due diligence fees (included in other income)   $ 3,600,000 $ 2,500,000 $ 12,200,000 $ 7,100,000    
Number of majority-owned Mexican subsidiaries involved in final funding           2  
Carrying value of affiliated loan receivable included in "Assets held for sale" 9,886,000           5,100,000
Carrying value of affiliated note payable included in Liabilities associated with assets held for sale $ 5,317,000           $ 5,100,000