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Significant Accounting Policies (Details) - USD ($)
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Significant Accounting Policies [Line Items]      
Ownership percentage 8.20% 8.20% 0.00%
Investment in unconsolidated entity $ 1,854,000 $ 1,854,000 $ 0
Impairment of unconsolidated entities $ 0 $ 0  
Undiscounted future minimum rentals due under non-cancelable leases     $ 175,400,000
Ashford Inc.      
Significant Accounting Policies [Line Items]      
Investment owned (in shares) 195 195 195
Ownership percentage 8.20% 8.20% 9.30%
Investment in unconsolidated entity $ 14,786,000 $ 14,786,000 $ 18,124,000
Minimum | Restricted Cash      
Significant Accounting Policies [Line Items]      
Replacement reserve escrow as percentage of property revenue   4.00%  
Maximum | Restricted Cash      
Significant Accounting Policies [Line Items]      
Replacement reserve escrow as percentage of property revenue   5.00%