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Fair Value of Assets and Liabilities - Nonrecurring Fair Value (Details) - Fair Value, Measurements, Nonrecurring
$ in Thousands
Dec. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real estate properties held for sale $ 1,928
Real estate properties at fair value 11,167
Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real estate properties held for sale 0
Real estate properties at fair value 0
Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real estate properties held for sale 1,928
Real estate properties at fair value 0
Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real estate properties held for sale 0
Real estate properties at fair value $ 11,167