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Transactions with Unconsolidated Joint Ventures (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]      
Receivables $ 153,969   $ 138,018
Joint Venture Partner      
Related Party Transaction [Line Items]      
Fees earned and payroll costs reimbursed from marketing services arrangement 300 $ 300  
Member of Unconsolidated Joint Venture      
Related Party Transaction [Line Items]      
Royalty and marketing and reservation system fees 4,600 4,600  
Receivables 1,000   $ 1,100
Commissions paid to travel agent $ 50 $ 44