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Real Estate (Acquisitions) (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Real Estate Properties [Line Items]    
Acquisitions of real estate assets $ 2,964,000 [1] $ 8,790,000 [2]
Payments for repurchase of redeemable noncontrolling interest   8,800,000
Corporate Joint Venture
   
Real Estate Properties [Line Items]    
Noncontrolling interest, ownership percentage by parent   63.00%
Joint venture, venture ownership percentage   37.00%
Real Estate Acquired in Satisfaction of Debt
   
Real Estate Properties [Line Items]    
Mortgage loans on real estate, foreclosures 77,900,000  
Real Estate Acquired in Satisfaction of Debt | Corporate Joint Venture
   
Real Estate Properties [Line Items]    
Mortgage loans on real estate, foreclosures   $ 25,500,000
Commercial Operating Properties | Real Estate Acquired in Satisfaction of Debt
   
Real Estate Properties [Line Items]    
Number of properties acquired 3  
[1] During the nine months ended September 30, 2014, the Company purchased two residential units for $3.0 million.
[2] During the nine months ended September 30, 2013, the Company paid $8.8 million to redeem a noncontrolling member's interest.