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Property, net - Assets measured on a nonrecurring basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 11,500 $ 66,000
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value measurements on a nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Significant Other Unobservable Inputs (Level 2) | Fair value measurements on a nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 11,500 0
Significant Unobservable Inputs (Level 3) | Fair value measurements on a nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 0 $ 66,000