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Financial Instruments and Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net $ 276,507 $ 276,163
Total indebtedness 1,501,896 1,488,718
Unsecured notes payable, net 358,847 432,990
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net 276,507 276,163
Carrying Amount [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net 276,507 276,163
Total indebtedness 1,143,049 1,055,728
Investment in non-traded equity securities 802 802
Carrying Amount [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured notes payable, net 358,847 432,990
Estimated Fair Value [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net 272,347 272,052
Total indebtedness 1,164,861 1,077,926
Investment in non-traded equity securities 25,194 25,194
Estimated Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unsecured notes payable, net $ 361,559 $ 435,779