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Financial Instruments and Fair Value Measurements - Schedule of Other Financial Instruments Carrying Values and Fair values (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable $ 134,692 $ 114,943
Mortgage and Other Notes Payable 1,811,484 1,708,196
Unsecured notes payable and Unsecured line of credit 472,507 477,320
Level 3 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable 135,562 114,943
Mortgage and Other Notes Payable 1,168,484 1,179,503
Investment in non-traded equity securities 2,019 1,778
Level 3 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable 136,003 113,422
Mortgage and Other Notes Payable 1,151,567 1,191,281
Investment in non-traded equity securities 1,654 57,964
Level 2 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured notes payable and Unsecured line of credit 650,195 538,425
Level 2 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured notes payable and Unsecured line of credit $ 631,555 $ 539,362