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Financial Instruments and Risk Management - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
aircraft
derivative_instrument
Derivative [Line Items]          
Unrealized loss on interest rate derivative instruments $ 0 $ 553 $ 0 $ 909  
Unrealized gain (loss) on interest rate derivative instruments, tax 0 (320) 0 (511)  
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion, Tax 32 15 97 15  
Accumulated other comprehensive loss (1,394)   (1,394)   $ (1,546)
Airbus A321 [Member] | 2015 [Member]          
Derivative [Line Items]          
Number of aircraft protected by interest rate derivatives schedule for delivery | aircraft         3
Commodity Option [Member]          
Derivative [Line Items]          
Payments for Premiums on Fuel Option Derivatives   300   2,500  
Interest Rate Swap [Member]          
Derivative [Line Items]          
Number of interest rate derivatives settled | derivative_instrument         6
Interest Rate Swap [Member] | Cash Flow Hedging [Member]          
Derivative [Line Items]          
Unrealized loss on interest rate derivative instruments   600   900  
Unrealized gain (loss) on interest rate derivative instruments, tax   300   500  
Loss reclassified from AOCI into earnings 56 25 170 25  
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion, Tax $ 32 $ 15 $ 97 $ 15