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Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair value measurements    
Mortgage loans receivable $ 223,053 $ 217,529
Senior unsecured notes, net of debt issue costs 447,256 451,372
Accrued incentives and earn-outs $ 12,572 $ 12,722
Level 3 | Senior Unsecured Notes maturing before 2026    
Fair value measurements    
Discount rate (as a percent) 4.30% 4.35%
Level 3 | Senior Unsecured Notes maturing 2026 and after    
Fair value measurements    
Discount rate (as a percent) 4.50% 4.65%
Level 3 | Earn-out liabilities    
Fair value measurements    
Discount rate (as a percent) 6.00% 6.10%
Level 3 | Mortgage Loans Receivable    
Fair value measurements    
Discount rate (as a percent) 9.00% 8.90%
Carrying Value    
Fair value measurements    
Bank borrowings $ 161,000 $ 120,500
Carrying Value | Level 3    
Fair value measurements    
Mortgage loans receivable 223,053 217,529
Senior unsecured notes, net of debt issue costs 447,256 451,372
Accrued incentives and earn-outs 12,572 12,722
Fair Value    
Fair value measurements    
Bank borrowings 161,000 120,500
Fair Value | Level 3    
Fair value measurements    
Mortgage loans receivable 262,956 257,335
Senior unsecured notes, net of debt issue costs 450,129 451,420
Accrued incentives and earn-outs $ 12,572 $ 12,722