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Maintenance Rights Intangible And Lease Premium, Net (Schedule Of Estimated Amortization Of The Lease Premium) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
2017 $ 31,177  
2018 24,871  
2019 21,176  
2020 21,176  
2021 21,176  
Thereafter 198,412  
Finite-lived intangible assets 317,988 $ 364,137
Lease Premium [Member]    
Finite-Lived Intangible Assets [Line Items]    
2017 13,633  
2018 11,219  
2019 10,466  
2020 7,727  
2021 5,394  
Thereafter 2,452  
Finite-lived intangible assets $ 50,891 $ 70,727