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

Fair value measurements (Fair value of flight equipment measured on non-recurring basis) (Details)

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Fair value measurements (Fair value of flight equipment measured on non-recurring basis) (Details) - Fair Value, Measurements, Nonrecurring [Member] - Flight Equipment [Member] - Level 3 - Income Approach Valuation Technique [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Flight equipment, fair value $ 355,923
Minimum [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Discount rate 0.00%
Remaining holding period 0 years
Non-contractual cash flows 0.00%
Maximum [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Discount rate 10.00%
Remaining holding period 13 years
Non-contractual cash flows 100.00%
Weighted Average [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Discount rate 5.00%
Remaining holding period 8 years
Non-contractual cash flows 38.00%