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Revenue Recognition Points Liability (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Points Liability [Abstract]        
Revenue, Performance Obligation, Description of Timing P12M      
Contract with Customer, Liability $ 19,343 $ 12,463 $ 15,613 $ 10,708
Points awarded 10,962 8,827    
Points redeemed (7,232) (7,072)    
Points Liability $ 12,400 $ 9,800