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Revenue Recognition Points Liability (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Points Liability [Abstract]        
Revenue, Performance Obligation, Description of Timing twelve months      
Contract with Customer, Liability $ 21,121 $ 14,731 $ 15,613 $ 10,708
Points awarded 15,018 14,308    
Points redeemed (9,510) (10,285)    
Points Liability $ 11,800 $ 10,600