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Fair Value of Financial Instruments - Schedule of Fair Values and Carrying Values of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]    
Notes receivable, net $ 62,807 $ 62,075
Fair Value, Inputs, Level 2 | Fair Value    
Assets, Fair Value Disclosure [Abstract]    
Total assets 83,184 79,778
Fair Value, Inputs, Level 2 | Carrying value    
Assets, Fair Value Disclosure [Abstract]    
Total assets 83,184 79,778
Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure [Abstract]    
Total assets 29,178 23,965
Fair Value, Inputs, Level 3 | Fair Value    
Liabilities, Fair Value Disclosure [Abstract]    
Debt, net 421,938 392,951
Total liabilities 421,938 392,951
Fair Value, Inputs, Level 3 | Carrying value    
Liabilities, Fair Value Disclosure [Abstract]    
Debt, net 404,900 377,582
Total liabilities 404,900 377,582
Debentures | Fair Value, Inputs, Level 2 | Fair Value    
Assets, Fair Value Disclosure [Abstract]    
Notes receivable, net 20,377 17,703
Debentures | Fair Value, Inputs, Level 2 | Carrying value    
Assets, Fair Value Disclosure [Abstract]    
Notes receivable, net 20,377 17,703
Notes Receivable | Fair Value, Inputs, Level 2 | Fair Value    
Assets, Fair Value Disclosure [Abstract]    
Notes receivable, net 62,807 62,075
Notes Receivable | Fair Value, Inputs, Level 2 | Carrying value    
Assets, Fair Value Disclosure [Abstract]    
Notes receivable, net $ 62,807 $ 62,075