Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Maintenance rights intangible and lease premium, net (Narrative) (Details)

v3.8.0.1
Maintenance rights intangible and lease premium, net (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Amortization of lease premium intangibles $ 13,632 $ 19,836 $ 23,042
Lease Premiums [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization of lease premium intangibles $ 13,600 $ 19,800 $ 23,000