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Financial Instruments and Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable $ 108,959 $ 153,829
Mortgage and Other Notes Payable 1,455,283 1,424,409
Unsecured notes payable and Unsecured line of credit 529,756 473,735
Carrying Amount | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable 108,959 153,829
Mortgage and Other Notes Payable 923,287 921,261
Investment in non-traded equity securities 0 0
Carrying Amount | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured notes payable and Unsecured line of credit 544,425 517,125
Estimated Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable 105,985 151,712
Mortgage and Other Notes Payable 912,968 921,891
Investment in non-traded equity securities 22,824 22,824
Estimated Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured notes payable and Unsecured line of credit $ 544,506 $ 515,330