Employee Benefits and Share-Based Compensation - Amounts Related to Shipboard Retirement Plan (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Pension expense: |
|
|
|
| Service cost |
$ 2,135
|
$ 2,167
|
$ 1,987
|
| Interest cost |
1,001
|
857
|
887
|
| Amortization of prior service cost |
378
|
378
|
378
|
| Amortization of actuarial loss |
|
51
|
40
|
| Total pension expense |
3,514
|
3,453
|
3,292
|
| Change in projected benefit obligation: |
|
|
|
| Projected benefit obligation at beginning of year |
24,318
|
24,587
|
22,605
|
| Service cost |
2,135
|
2,167
|
1,987
|
| Interest cost |
1,001
|
857
|
887
|
| Actuarial gain (loss) |
2,308
|
(2,271)
|
458
|
| Direct benefit payments |
(1,067)
|
(1,022)
|
(1,350)
|
| Projected benefit obligation at end of year |
28,695
|
24,318
|
24,587
|
| Amounts recognized in the consolidated balance sheets: |
|
|
|
| Projected benefit obligation |
28,695
|
24,318
|
24,587
|
| Amounts recognized in accumulated other comprehensive income (loss): |
|
|
|
| Prior service cost |
(3,781)
|
(4,159)
|
(4,537)
|
| Accumulated actuarial loss |
(3,413)
|
(1,105)
|
(3,426)
|
| Accumulated other comprehensive income (loss) |
$ (7,194)
|
$ (5,264)
|
$ (7,963)
|