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Intangible Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 494,560
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	$ 97,400
Weighted Average Amortization Period (Years)	15 years
Galapagos operating licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	$ 36,100
Weighted Average Amortization Period (Years)	26 years	26 years 7 months 6 days
Other finite-life intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	$ 11,560
Weighted Average Amortization Period (Years)	2 years
Silversea Cruises trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 349,500

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Topic 350
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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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-Topic 805
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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