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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair value measurements    
Mortgage loans receivable $ 223,907 $ 229,801
Senior unsecured notes, net of debt issue costs 571,002 502,291
Accrued incentives and earn-outs 8,916 12,229
Carrying Value    
Fair value measurements    
Mortgage loans receivable 223,907 229,801
Bank borrowings 96,500 107,100
Senior unsecured notes, net of debt issue costs 571,002 502,291
Accrued incentives and earn-outs 8,916 12,229
Fair Value    
Fair value measurements    
Bank borrowings 96,500 107,100
Fair Value | Level 3    
Fair value measurements    
Mortgage loans receivable 278,224 294,319
Senior unsecured notes, net of debt issue costs 577,126 498,915
Accrued incentives and earn-outs $ 8,916 $ 12,229