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, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension expense:            
Service cost $ 1,863 $ 1,793 $ 1,393      
Interest cost 874 738 728      
Amortization of prior service cost 378 378 378      
Amortization of actuarial loss 54 99      
Total pension expense 3,169 3,008 2,499      
Change in projected benefit obligation:            
Projected benefit obligation at beginning of year 21,078 19,730 15,570      
Service cost 1,863 1,793 1,393      
Interest cost 874 738 728      
Actuarial gain (loss) (65) (625) 2,689      
Direct benefit payments (1,145) (558) (650)      
Projected benefit obligation at end of year 22,605 21,078 19,730      
Amounts recognized in the consolidated balance sheets:            
Projected benefit obligation $ 21,078 $ 19,730 $ 19,730 $ 22,605 $ 21,078 $ 19,730
Amounts recognized in accumulated other comprehensive income (loss):            
Prior service cost       (4,915) (5,293) (5,671)
Accumulated actuarial loss       (3,008) (3,126) (3,849)
Accumulated other comprehensive income (loss)       $ (7,923) $ (8,419) $ (9,520)