| Schedule of accumulated other comprehensive income (loss) | 
|   | 
  | 
Year Ended December 31, 2018 | 
  | 
 
|   | 
  | 
Accumulated Other Comprehensive Income (Loss) | 
  | 
  | 
Change Related to Cash Flow Hedges | 
  | 
  | 
Change Related to Shipboard Retirement Plan | 
  | 
 
| Accumulated other comprehensive income (loss) at beginning of period | 
  | 
$ | 
26,966 | 
  | 
  | 
$ | 
33,861 | 
  | 
  | 
$ | 
(6,895 | 
) | 
 
| Current period other comprehensive income (loss) before reclassifications | 
  | 
  | 
(158,943 | 
) | 
  | 
  | 
(161,214 | 
) | 
  | 
  | 
2,271 | 
  | 
 
| Amounts reclassified into earnings | 
  | 
  | 
(29,670 | 
) | 
  | 
  | 
(30,096 | 
)(1) | 
  | 
  | 
426 | 
(2) | 
 
| Accumulated other comprehensive income (loss) at end of period | 
  | 
$ | 
(161,647 | 
) | 
  | 
$ | 
(157,449 | 
)(3) | 
  | 
$ | 
(4,198 | 
) | 
 
 
   
|   | 
  | 
Year Ended December 31, 2017 | 
  | 
 
|   | 
  | 
Accumulated Other Comprehensive Income (Loss) | 
  | 
  | 
Change Related to Cash Flow Hedges | 
  | 
  | 
Change Related to Shipboard Retirement Plan | 
  | 
 
| Accumulated other comprehensive income (loss) at beginning of period | 
  | 
$ | 
(314,473 | 
) | 
  | 
$ | 
(307,618 | 
) | 
  | 
$ | 
(6,855 | 
) | 
 
| Current period other comprehensive income (loss) before reclassifications | 
  | 
  | 
304,226 | 
  | 
  | 
  | 
304,684 | 
  | 
  | 
  | 
(458 | 
) | 
 
| Amounts reclassified into earnings | 
  | 
  | 
37,213 | 
  | 
  | 
  | 
36,795 | 
(1) | 
  | 
  | 
418 | 
(4) | 
 
| Accumulated other comprehensive income (loss) at end of period | 
  | 
$ | 
26,966 | 
  | 
  | 
$ | 
33,861 | 
  | 
  | 
$ | 
(6,895 | 
) | 
 
 
   
|   | 
  | 
Year Ended December 31, 2016 | 
  | 
 
|   | 
  | 
Accumulated Other Comprehensive Income (Loss) | 
  | 
  | 
Change Related to Cash Flow Hedges | 
  | 
  | 
Change Related to Shipboard Retirement Plan | 
  | 
 
| Accumulated other comprehensive income (loss) at beginning of period | 
  | 
$ | 
(412,650 | 
) | 
  | 
$ | 
(405,298 | 
) | 
  | 
$ | 
(7,352 | 
) | 
 
| Current period other comprehensive income before reclassifications | 
  | 
  | 
1,776 | 
  | 
  | 
  | 
1,711 | 
  | 
  | 
  | 
65 | 
  | 
 
| Amounts reclassified into earnings | 
  | 
  | 
96,401 | 
  | 
  | 
  | 
95,969 | 
(1) | 
  | 
  | 
432 | 
(4) | 
 
| Accumulated other comprehensive income (loss) at end of period | 
  | 
$ | 
(314,473 | 
) | 
  | 
$ | 
(307,618 | 
) | 
  | 
$ | 
(6,855 | 
) | 
 
 
  
| (1) | 
We refer you to Note 9— “Fair Value Measurements and Derivatives” in these notes to consolidated financial statements for the affected line items in the consolidated statements of operations. | 
 
| (2) | 
Amortization of prior-service cost and actuarial loss reclassified to other income (expense), net. | 
 
| (3) | 
Includes $21.1 million of loss expected to be reclassified into earnings in the next 12 months. | 
 
| (4) | 
Amortization of prior-service cost and actuarial loss reclassified to payroll and related expense. | 
 
 
 |