Fair Value Measurements and Derivatives - Effects of cash flow hedge accounting on consolidated statements of operations (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Fuel |
$ 409,602
|
$ 392,685
|
$ 361,032
|
| Depreciation and amortization |
646,188
|
561,060
|
509,957
|
| Interest expense, net |
272,867
|
270,404
|
267,804
|
| Cash Flow Hedging |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income |
8,898
|
30,096
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (before ASU adoption) |
|
|
(36,795)
|
| Fuel |
|
|
361,032
|
| Depreciation and amortization |
|
|
509,957
|
| Interest expense, net |
|
|
(267,804)
|
| Cash Flow Hedging | Fuel |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income |
14,093
|
34,410
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (before ASU adoption) |
|
|
(29,721)
|
| Cash Flow Hedging | Depreciation and amortization |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income |
(3,062)
|
(3,463)
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (before ASU adoption) |
|
|
(4,077)
|
| Cash Flow Hedging | Interest expense, net |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income |
(2,133)
|
(851)
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (before ASU adoption) |
|
|
(2,997)
|
| Cash Flow Hedging | Fuel contracts | Fuel |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income |
14,093
|
34,410
|
|
| Cash Flow Hedging | Foreign currency contracts | Depreciation and amortization |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income |
(3,062)
|
(3,463)
|
|
| Cash Flow Hedging | Interest rate contracts | Interest expense, net |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income |
$ (2,133)
|
$ (851)
|
|
| Designated as Hedging Instrument | Cash Flow Hedging | Fuel contracts |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (before ASU adoption) |
|
|
(29,721)
|
| Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency contracts |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (before ASU adoption) |
|
|
(4,077)
|
| Designated as Hedging Instrument | Cash Flow Hedging | Interest rate contracts |
|
|
|
| Derivative Instruments Gain Loss [Line Items] |
|
|
|
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (before ASU adoption) |
|
|
$ (2,997)
|