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

Commitments and contingencies (Movements in prepayments on flight equipment) (Details)

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Commitments and contingencies (Movements in prepayments on flight equipment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deposits on Flight Equipment [Roll Forward]    
Prepayments on flight equipment at beginning of period $ 3,265,979 $ 3,300,426
Prepayments made during the period 1,162,884 837,776
Interest paid and capitalized during the period 107,364 107,688
Prepayments and capitalized interest applied to the purchase of flight equipment (1,605,924) (979,911)
Prepayments on flight equipment at end of period $ 2,930,303 $ 3,265,979