Redeemable Noncontrolling Interest (Schedule of Redeemable Noncontrolling Interest) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 542,020	$ 0
Additions (Silversea Cruises acqusition)		537,770
Net income attributable to noncontrolling interest, including the contractual accretion of the put options	28,713	4,750	$ 0
Other		(500)
Distribution to noncontrolling interest	(752)
Ending balance	$ 569,981	$ 542,020	$ 0

Noncontrolling Interest, Other Increase (Decrease)

No definition available.

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- Definition

Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

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Amount of increase in noncontrolling interest from a business combination.

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- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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