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Financial Instruments and Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes receivable, net   $ 276,163 $ 147,188  
Total indebtedness   1,488,718 1,358,606  
Unsecured notes payable, net   432,990 287,755  
Unsecured line of credit   0 20,800  
Asset Impairment Charges   0 5,000 $ 0
Brandywine Portfolio [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset Impairment Charges $ 5,000   5,000  
Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes receivable, net     147,188  
Total indebtedness     1,050,051  
Investment in non-traded equity securities     411  
Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Unsecured notes payable, net     287,755  
Unsecured line of credit     20,800  
Carrying Amount [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes receivable, net   276,163    
Total indebtedness   1,055,728    
Investment in non-traded equity securities   802    
Carrying Amount [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Unsecured notes payable, net   432,990    
Unsecured line of credit   0    
Estimated Fair Value [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes receivable, net   272,052 147,188  
Total indebtedness   1,077,926 1,072,473  
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   435,779 288,964  
Unsecured line of credit   $ 0 $ 20,881