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Fair Value Measurements - Nonrecurring Basis (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
engine
Dec. 31, 2018
USD ($)
engine
Dec. 31, 2018
USD ($)
airframe_part_package
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Assets at fair value and gains (losses) recorded          
Asset write-down $ 18,220     $ 10,651  
Number of assets impaired 16 6 6    
Impaired assets, remaining carrying value $ 37,800 $ 18,300 $ 18,300 18,300  
Nonrecurring          
Assets at fair value and gains (losses) recorded          
Total losses on equipment held for lease 18,132     8,893  
Total losses on equipment held for sale 88     1,758  
Total losses on assets 18,220     10,651  
Asset write-down $ 18,200     8,900 $ 10,700
Inventory write-offs       $ 1,800  
Assets To Be Sold Or Parted Out          
Assets at fair value and gains (losses) recorded          
Number of assets impaired | engine 11        
Assets To Be Sold Or Parted Out | Nonrecurring          
Assets at fair value and gains (losses) recorded          
Asset write-down $ 11,800        
Impaired Assets          
Assets at fair value and gains (losses) recorded          
Number of assets impaired | engine 7 7      
Impaired Assets | Nonrecurring          
Assets at fair value and gains (losses) recorded          
Asset write-down $ 6,400