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Significant Accounting Policies (Schedule of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Significant Accounting Policies [Abstract]    
Revenue from contracts with customers [1] $ 40,620 $ 36,398
Interest income 19 21
Cost recovery income
Dividend Revenue
Total revenue $ 40,639 $ 36,419
[1] Net operating revenue for Corporate and Other primarily relates to the Company's cruise ship operations.