Annual report pursuant to Section 13 and 15(d)

Employee Benefits and Share-Based Compensation - Amounts Related to Shipboard Retirement Plan (Details 5)

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Employee Benefits and Share-Based Compensation - Amounts Related to Shipboard Retirement Plan (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension expense:      
Service cost $ 2,167 $ 1,987 $ 1,863
Interest cost 857 887 874
Amortization of prior service cost 378 378 378
Amortization of actuarial loss 51 40 54
Total pension expense 3,453 3,292 3,169
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 24,587 22,605 21,078
Service cost 2,167 1,987 1,863
Interest cost 857 887 874
Actuarial gain (loss) (2,271) 458 (65)
Direct benefit payments (1,022) (1,350) (1,145)
Projected benefit obligation at end of year 24,318 24,587 22,605
Amounts recognized in the consolidated balance sheets:      
Projected benefit obligation 24,318 24,587 22,605
Amounts recognized in accumulated other comprehensive income (loss):      
Prior service cost (4,159) (4,537) (4,915)
Accumulated actuarial loss (1,105) (3,426) (3,008)
Accumulated other comprehensive income (loss) $ (5,264) $ (7,963) $ (7,923)