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Lease Rental Revenues and Flight Equipment Held for Lease (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Lessee
Sep. 30, 2016
Lessee
Sep. 30, 2017
USD ($)
Lessee
Sep. 30, 2016
Lessee
Dec. 31, 2016
USD ($)
Customer Group One          
Revenue, Major Customer [Line Items]          
Entity-Wide Revenue, Major Customer, Number | Lessee 4 4 4 4  
Lease Rental Revenue | Customer Concentration Risk | Customer Group One          
Revenue, Major Customer [Line Items]          
Percentage of geographic concentration 25.00% 25.00% 24.00% 25.00%  
Maintenance Payments {Member]          
Revenue, Major Customer [Line Items]          
Amounts of lease incentive liabilities recorded in the consolidated balance sheets | $ $ 9,637   $ 9,637   $ 14,931