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

General (Guggenheim Transaction) (Narrative) (Details)

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General (Guggenheim Transaction) (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
item
Variable Interest Entity [Line Items]      
Number of aircraft | item 1,109    
Gain on sale of assets | $ $ 183,328 $ 37,497 $ 41,873
Guggenheim [Member]      
Variable Interest Entity [Line Items]      
Ownership percentage     19.00%
Gain on sale of assets | $     $ 10,500
Boeing 737-800 Aircraft [Member] | Guggenheim [Member]      
Variable Interest Entity [Line Items]      
Number of aircraft | item     8