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Fair Value Measurements (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair value measurements    
Mortgage loans receivable $ 232,897 $ 217,529
Senior unsecured notes, net of debt issue costs 484,734 451,372
Accrued incentives and earn-outs $ 13,717 $ 12,722
Level 3 | Senior Unsecured Notes maturing before 2026    
Fair value measurements    
Discount rate (as a percent) 3.55% 4.35%
Level 3 | Senior Unsecured Notes maturing 2026 and after    
Fair value measurements    
Discount rate (as a percent) 3.75% 4.65%
Level 3 | Accrued incentives and earn-out liabilities    
Fair value measurements    
Discount rate (as a percent) 6.10%  
Level 3 | Mortgage Loans Receivable    
Fair value measurements    
Discount rate (as a percent) 9.10% 8.90%
Carrying Value    
Fair value measurements    
Bank borrowings $ 122,000 $ 120,500
Carrying Value | Level 3    
Fair value measurements    
Mortgage loans receivable 232,897 217,529
Senior unsecured notes, net of debt issue costs 484,734 451,372
Accrued incentives and earn-outs 13,717 12,722
Fair Value    
Fair value measurements    
Bank borrowings 122,000 120,500
Fair Value | Level 3    
Fair value measurements    
Mortgage loans receivable 270,061 257,335
Senior unsecured notes, net of debt issue costs 507,387 451,420
Accrued incentives and earn-outs $ 13,717 $ 12,722