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REVENUE RECOGNITION - Loyalty Programs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Hotel      
Disaggregation of Revenue [Line Items]      
Goods and services provided without charge $ 15,099 $ 19,939 $ 11,697
Food and beverage      
Disaggregation of Revenue [Line Items]      
Goods and services provided without charge 18,548 31,569 23,051
Other      
Disaggregation of Revenue [Line Items]      
Goods and services provided without charge 3,031 7,594 5,772
Loyalty programs      
Disaggregation of Revenue [Line Items]      
Goods and services provided without charge $ 36,678 $ 59,102 $ 40,520