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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Entity
segment
$ / shares
Mar. 31, 2019
USD ($)
Apr. 30, 2020
USD ($)
NumberOfAirlines
Apr. 14, 2020
Variable Interest Entity [Line Items]        
Deferred Lease Income, Current $ 18,545      
Business Acquisition, Share Price | $ / shares $ 32.00      
Number of Operating Segments | segment 1      
Net Cash and Restricted Cash Provided by (Used in) Operating Activities $ 69,217 $ 106,360    
Gain on sale of flight equipment 27,049 12,002    
Revenues $ 282,498 $ 213,927    
Variable Interest Entity, Primary Beneficiary [Member]        
Variable Interest Entity [Line Items]        
Number of Consolidated Variable Interest Entities | Entity 4      
Subsequent Event        
Variable Interest Entity [Line Items]        
IATA estimated percentage of normal air traffic       20.00%
Deferred Lease Income, Current     $ 70,000  
Number of Airlines | NumberOfAirlines     35