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Schedule IV Mortgage Loans Receivable on Real Estate (Parenthetical) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 27, 2018
Feb. 16, 2018
Aug. 01, 2017
Jan. 30, 2017
Dec. 31, 2018
Mortgage Loans On Real Estate [Line Items]          
Loan interest rate       9.60%  
Mortgage Loans on Real Estate         $ 46,343
Mortgage loans on prior liens         31,785
Aggregate cost for federal income tax purposes         45,000
Springfield, Massachusetts          
Mortgage Loans On Real Estate [Line Items]          
Term on mortgage loan 10 years        
Mortgage note, maturity date Jun. 30, 2023        
Repayment of mortgage loan principal $ 1,000        
Webster, Texas          
Mortgage Loans On Real Estate [Line Items]          
Loan interest rate   12.00% 10.00%    
Meridian, Idaho | Maximum          
Mortgage Loans On Real Estate [Line Items]          
Mortgage Loans on Real Estate         $ 19,000
Clarksville, Indiana          
Mortgage Loans On Real Estate [Line Items]          
Loan interest rate         9.50%
Percentage of interest rate using claw-back feature         15.00%
Mortgage loans on prior liens         $ 15,800