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Supplemental Financial Information - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Supplemental Financial Information [Abstract]    
Maintenance $ 161,975 $ 136,315
Deferred grant income 132,877 0
Customer maintenance reserves 96,131 110,355
Salaries, wages and benefits 88,180 75,719
Deferred revenue 38,437 26,357
Aircraft fuel 34,726 28,821
Other 100,927 104,158
Accrued liabilities $ 653,253 $ 481,725