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Fair Value Measurements (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
item
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset impairment charges | $ $ 81,607 $ 16,335 $ 21,828
Number of aircraft impaired 35 8 8
Lease revenue | $ $ 4,867,623 $ 4,991,551 $ 3,449,571
Number of engines impaired   12 3
Flight Equipment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated useful life of asset, years 25 years    
Lease Termination Or Amendment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of aircraft impaired 25 4  
Lease revenue | $ $ 95,900 $ 20,500  
Part Of Sale Transactions And Classified As Flight Equipment Held For Sale [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of aircraft impaired 10