Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives (Details 3)

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Fair Value Measurements and Derivatives (Details 3) - Cash Flow Hedging - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivatives Fair Value [Line Items]        
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income $ 6,723 $ (10,244) $ 8,508 $ (19,949)
Fuel        
Derivatives Fair Value [Line Items]        
Total amounts of income and expense line items presented in the consolidated statements of operations in which the effects of cash flow hedges are recorded 95,212 86,663 188,643 175,549
Depreciation and amortization expense        
Derivatives Fair Value [Line Items]        
Total amounts of income and expense line items presented in the consolidated statements of operations in which the effects of cash flow hedges are recorded 140,704 123,141 271,948 242,346
Interest expense, net        
Derivatives Fair Value [Line Items]        
Total amounts of income and expense line items presented in the consolidated statements of operations in which the effects of cash flow hedges are recorded 72,988 64,196 132,686 117,156
Fuel contracts | Fuel        
Derivatives Fair Value [Line Items]        
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income 7,904 (8,584) 11,429 (16,587)
Foreign currency forward contracts | Depreciation and amortization expense        
Derivatives Fair Value [Line Items]        
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income (899) (895) (2,058) (1,752)
Interest Rate Swap | Interest expense, net        
Derivatives Fair Value [Line Items]        
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income $ (282) $ (765) $ (863) $ (1,610)