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Property, net - Assets Measured on a Nonrecurring Basis (Details) - Nonrecurring - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Fair Value Measurement $ 104,700 $ 38,000   $ 86,100
(Level 1)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Fair Value Measurement 0   $ 0 0
(Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Fair Value Measurement 104,700   38,000 0
(Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Fair Value Measurement $ 0   $ 0 $ 86,100