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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loan
Dec. 31, 2013
USD ($)
Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Pre-modification outstanding recorded investment $ 11,600,000    
Unfunded commitments, troubled debt restructurings 0    
Non-performing mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans | Loan   1  
Recorded investment of loans whose maturity was extended     $ 174,500,000
Non-performing mortgage | One Year Payment Extension      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans | Loan     2
Recorded investment of loans whose maturity was extended   $ 7,000,000 $ 98,300,000
Initial paydowns loans whose maturity was extended     $ 15,400,000
Finance receivable, trouble debt restructuring time period   1 year  
Senior mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans | Loan     6
Performing First Mortgage | One Year Payment Extension      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment of loans whose maturity was extended     $ 4,600,000
Individually Evaluated for Impairment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Pre-modification outstanding recorded investment $ 5,800,000