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Other Liabilities - Changes in Contract Liabilities (Details) - Club Membership - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Change in contract with customer liability    
Balance at beginning of period $ 6,917 $ 5,676
New club memberships 6,268 3,083
Revenue from amounts included in contract liability opening balance (2,062) (1,553)
Revenue from current period new memberships (407) (289)
Balance at end of period $ 10,716 $ 6,917