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Other income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Component of Operating Income [Line Items]      
Management fees $ 14,539 $ 13,426 $ 18,298
Interest and other income 47,025 81,172 127,688
Total other income $ 61,564 94,598 145,986
Income from lease termination   $ 46,500 63,200
Income from net insurance proceeds     54,200
Gain on refinance of notes receivable     27,700
AeroTurbine, Inc.      
Component of Operating Income [Line Items]      
Expense related to a lower of cost or market adjustment of parts inventory     $ 36,000