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Revenue Recognition Passenger Revenue (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended
Apr. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Revenue Recognition [Abstract]      
Contract with Customer, Liability, Forward Bookings   34.70%  
Contract with Customer, Liability, Credit Voucher Bookings   65.30%  
Revenue, Performance Obligation, Description of Timing   twelve months  
Increase (Decrease) in Revenue from Contract with Customer   $ 204,100  
Contract with Customer, Liability, Current   $ 334,061 $ 249,950
Credit Voucher Term Expiration 2 years