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

General (Details)

v3.8.0.1
General (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
aircraft
Dec. 31, 2016
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Total assets | $ $ 42,040,144 $ 41,620,453
Number of owned aircraft | aircraft 980