Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Derivatives measured at fair value and disclosed by balance sheet location (Details)

v3.3.1.900
Fair Value Measurements and Derivatives - Derivatives measured at fair value and disclosed by balance sheet location (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 3,446  
Designated as Hedging Instrument | Fuel Swaps | Accrued expenses and other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value
Derivative liabilities, fair value $ 128,740 $ 111,304
Designated as Hedging Instrument | Fuel Swaps | Other long-term liabilities    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value   190
Derivative liabilities, fair value 132,494 $ 77,250
Designated as Hedging Instrument | Foreign currency forward contracts | Other long-term assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 3,446  
Derivative liabilities, fair value 1,370  
Designated as Hedging Instrument | Foreign currency forward contracts | Accrued expenses and other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value  
Derivative liabilities, fair value 8,737 $ 29,498
Designated as Hedging Instrument | Foreign currency forward contracts | Other long-term liabilities    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 551  
Derivative liabilities, fair value 24,181 $ 118
Designated as Hedging Instrument | Interest rates swaps | Accrued expenses and other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value  
Derivative liabilities, fair value 4,079 $ 5,736
Designated as Hedging Instrument | Interest rates swaps | Other long-term liabilities    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value  
Derivative liabilities, fair value $ 3,395 $ 3,104
Not Designated as Hedging Instrument | Foreign currency collar | Accrued expenses and other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value
Derivative liabilities, fair value $ 42,993
Not Designated as Hedging Instrument | Foreign currency collar | Other long-term liabilities    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value
Derivative liabilities, fair value   $ 16,744
Not Designated as Hedging Instrument | Interest rates swaps | Accrued expenses and other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value  
Derivative liabilities, fair value $ 3,823