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Revenue Recognition Points Liability (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Points Liability [Abstract]        
Contract with Customer, Liability $ 24,154 $ 19,343 $ 21,841 $ 15,613
Points awarded 10,696 10,962    
Points redeemed (8,383) (7,232)    
Points Liability $ 11,700 $ 12,400    
Revenue, Performance Obligation, Description of Timing 12 months