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Debt (ALS II Narrative) (Details) - ALS II Debt [Member]
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2008
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Dec. 31, 2015
USD ($)
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Debt Instrument [Line Items]    
Number of aircraft financed 30  
Number of aircraft designated as collateral   30
Debt Instrument, Collateral Amount | $   $ 895.2