Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Derivatives Designated as Cash Flow Hedges (Details 2)

v3.19.1
Fair Value Measurements and Derivatives - Effects of Derivatives Designated as Cash Flow Hedges (Details 2) - Cash Flow Hedging - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Other Comprehensive Income $ 15,152 $ 48,576
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income 7,000 1,785
Fuel contracts | Fuel    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Other Comprehensive Income 96,508 (6,012)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income 7,518 3,525
Foreign currency forward contracts | Depreciation and amortization expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Other Comprehensive Income (80,278) 54,493
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (703) (1,159)
Interest rate contracts | Interest expense, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Other Comprehensive Income (1,078) 95
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income $ 185 $ (581)