Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Commitments And Contingencies (Summary Of Movements In Prepayments On Flight Equipment) (Details)

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Commitments And Contingencies (Summary Of Movements In Prepayments On Flight Equipment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Commitments And Contingencies [Abstract]    
Net book value at beginning of period $ 3,300,426 $ 3,486,514
Prepayments made during the period 837,776 747,541
Interest capitalized during the period 107,688 79,230
Prepayments and capitalized interest applied to the purchase of flight equipment (979,911) (1,012,859)
Net book value at end of period $ 3,265,979 $ 3,300,426