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Fair Value of Financial Instruments - Schedule of Fair Values and Carrying Values of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Assets    
Notes receivable, net $ 75,448 $ 62,075
Fair Value, Inputs, Level 2 | Fair Value    
Assets    
Total assets 96,201 79,778
Fair Value, Inputs, Level 2 | Carrying value    
Assets    
Total assets 96,201 79,778
Fair Value, Inputs, Level 3    
Assets    
Total assets 35,626 23,965
Fair Value, Inputs, Level 3 | Fair Value    
Liabilities    
Debt, net 404,564 392,951
Total liabilities 404,564 392,951
Fair Value, Inputs, Level 3 | Carrying value    
Liabilities    
Debt, net 385,064 377,582
Total liabilities 385,064 377,582
Debentures | Fair Value, Inputs, Level 2 | Fair Value    
Assets    
Notes receivable, net 20,753 17,703
Debentures | Fair Value, Inputs, Level 2 | Carrying value    
Assets    
Notes receivable, net 20,753 17,703
Notes Receivable | Fair Value, Inputs, Level 2 | Fair Value    
Assets    
Notes receivable, net 75,448 62,075
Notes Receivable | Fair Value, Inputs, Level 2 | Carrying value    
Assets    
Notes receivable, net $ 75,448 $ 62,075