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Loans Receivable - Loans Receivable Secured by Real Estate (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loans receivable        
Number of Loans (in loans) | loan 5      
Face Amount of Mortgages $ 161,964      
Carrying Amount 161,964 $ 42,037 $ 188,418 $ 196,359
Interest income $ 9,844 $ 10,406 $ 56,237  
Mortgage loan on real estate, Texas due 2021        
Loans receivable        
Number of Loans (in loans) | loan 1      
Face Amount of Mortgages $ 2,250      
Carrying Amount $ 2,250      
Interest Rate 7.50%      
Mortgage loan on real estate, Florida due 2021        
Loans receivable        
Number of Loans (in loans) | loan 1      
Face Amount of Mortgages $ 8,290      
Carrying Amount $ 8,290      
Interest Rate 7.50%      
Mortgage loan on real estate, Washington due 2022        
Loans receivable        
Number of Loans (in loans) | loan 1      
Face Amount of Mortgages $ 102,412      
Carrying Amount $ 102,412      
Interest Rate 6.50%      
Percent of appreciation Company may participate in 0.20      
Mortgage loan on real estate, Illinois due 2022        
Loans receivable        
Number of Loans (in loans) | loan 1      
Face Amount of Mortgages $ 4,200      
Carrying Amount $ 4,200      
Interest Rate 5.75%      
Mortgage loan on real estate, Florida due 2026        
Loans receivable        
Number of Loans (in loans) | loan 1      
Face Amount of Mortgages $ 44,812      
Carrying Amount $ 44,812      
Interest Rate 2.00%      
Real Estate Secured        
Loans receivable        
Interest income $ 6,000      
LIBOR | Mortgage loan on real estate, Florida due 2026        
Loans receivable        
Interest Rate 4.25%