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(Maintenance rights and lease premium, net) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Maintenance rights $ 727,673 $ 794,798
Lease premium, net 10,554 14,817
Maintenance rights and lease premium, net $ 738,227 $ 809,615