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Fair Value Measurements - Nonrecurring Fair Value Measurements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2019
Fair Value Measurements [Line Items]        
Provision for impairment $ 12,298 $ 2,079 $ 67,003  
Nonrecurring Fair Value Measurements        
Fair Value Measurements [Line Items]        
Fair value of investment properties 16,944      
Provision for impairment 12,298      
Fair value, Level 2 | Nonrecurring Fair Value Measurements        
Fair Value Measurements [Line Items]        
Fair value of investment properties 11,644      
Fair value, Level 3 | Nonrecurring Fair Value Measurements        
Fair Value Measurements [Line Items]        
Fair value of investment properties $ 5,300      
Weighted average | Discount rate        
Fair Value Measurements [Line Items]        
Input for measuring investment property       0.0689