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Fair Value Measurements - Nonrecurring Fair Value Measurements (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Provision for impairment $ 0 $ 0 $ 346 $ 0 $ 12,298
Nonrecurring Fair Value Measurements          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of investment property         16,944
Nonrecurring Fair Value Measurements | Fair value, Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of investment property         11,644
Nonrecurring Fair Value Measurements | Fair Value, Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of investment property         $ 5,300
Weighted average | Discount rate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Input for measuring investment property         0.0689