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Lease Rental Revenues and Flight Equipment Held for Lease (Details 3)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Aircraft
Dec. 31, 2018
USD ($)
Aircraft
Dec. 31, 2017
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net Book Value | $ $ 7,375,018 $ 6,935,585  
A-320-200 [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Offlease Aircraft with Future Lease Commitments 1 10  
A-330-200 [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Offlease Aircraft with Future Lease Commitments 1 1  
B-737-800 [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Offlease Aircraft with Future Lease Commitments   1  
Number of Offlease Aircraft Marketed for Lease 1    
INDIA      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net Book Value | $ $ 924,190 $ 865,046  
Geographic Concentration Risk | Leased Assets      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of Aircraft 278 248  
Percentage of geographic concentration 100.00% 100.00%  
Geographic Concentration Risk | Leased Assets | Asia and Pacific      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of Aircraft 94 78  
Percentage of geographic concentration 38.00% 36.00%  
Geographic Concentration Risk | Leased Assets | Europe      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of Aircraft 99 87  
Percentage of geographic concentration 26.00% 27.00%  
Geographic Concentration Risk | Leased Assets | Middle East and Africa      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of Aircraft 16 17  
Percentage of geographic concentration 7.00% 8.00%  
Geographic Concentration Risk | Leased Assets | North America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of Aircraft 40 35  
Percentage of geographic concentration 13.00% 10.00%  
Geographic Concentration Risk | Leased Assets | South America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of Aircraft 26 16  
Percentage of geographic concentration 15.00% 10.00%  
Geographic Concentration Risk | Leased Assets | Off-lease      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of Aircraft 3 15  
Percentage of geographic concentration 1.00% 9.00%  
Maintenance revenue      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from contract with customer | $ $ 74,987 $ 105,738 $ 56,128
Maintenance revenue | INDIA      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from contract with customer | $ $ 14,915