Annual report pursuant to Section 13 and 15(d)

Employee Benefits and Share-Based Compensation - Amounts Related to Shipboard Retirement Plan (Details 6)

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Employee Benefits and Share-Based Compensation - Amounts Related to Shipboard Retirement Plan (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension expense:      
Service cost $ 1,987 $ 1,863 $ 1,793
Interest cost 887 874 738
Amortization of prior service cost 378 378 378
Amortization of actuarial loss 40 54 99
Total pension expense 3,292 3,169 3,008
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 22,605 21,078 19,730
Service cost 1,987 1,863 1,793
Interest cost 887 874 738
Actuarial gain (loss) 458 (65) (625)
Direct benefit payments (1,350) (1,145) (558)
Projected benefit obligation at end of year 24,587 22,605 21,078
Amounts recognized in the consolidated balance sheets:      
Projected benefit obligation 24,587 22,605 21,078
Amounts recognized in accumulated other comprehensive income (loss):      
Prior service cost (4,537) (4,915) (5,293)
Accumulated actuarial loss (3,426) (3,008) (3,126)
Accumulated other comprehensive income (loss) $ (7,963) $ (7,923) $ (8,419)