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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.

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- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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