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

Summary of significant accounting policies (Details)

v3.19.3.a.u2
Summary of significant accounting policies (Details)
$ in Thousands
12 Months Ended
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
segment
Jan. 01, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Minimum aircraft age threshold for performance of impairment assessments   5 years  
Number of operating segments | segment   1  
Number of reportable segments | segment   1  
Operating lease right of use asset   $ 43,668  
Present value of lease liabilities   $ 51,144  
Flight Equipment      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of asset, years   25 years  
Percentage of estimates for residual values of original manufacture cost   15.00%  
Accounting Standards Update 2016-02      
Summary Of Significant Accounting Policies [Line Items]      
Operating lease right of use asset     $ 58,000
Present value of lease liabilities     $ 58,000
Forecast | Accounting Standards Update 2016-13      
Summary Of Significant Accounting Policies [Line Items]      
Cumulative effect adjustment to reduce retained earnings $ 25,000