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Financial Instruments and Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net $ 249,848 $ 276,163
Mortgage and Other Notes Payable, net 1,543,753 1,488,718
Unsecured notes payable and Unsecured line of credit, net 397,622 432,990
Carrying Amount | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net 249,848 276,163
Mortgage and Other Notes Payable, net 1,137,660 1,071,034
Investment in non-traded equity securities 802 802
Carrying Amount | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured notes payable and Unsecured line of credit, net 423,320 434,636
Estimated Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net 244,544 272,052
Mortgage and Other Notes Payable, net 1,144,720 1,077,926
Investment in non-traded equity securities 25,194 25,194
Estimated Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured notes payable and Unsecured line of credit, net $ 424,367 $ 435,779