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Property and Equipment (Narrative) (Details) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) ship	Dec. 31, 2017 USD ($) loan aircraft	Dec. 31, 2016 USD ($) ship	Dec. 31, 2018 EUR (€) ship	Jul. 31, 2018 ship	Dec. 31, 2017 EUR (€)	Jul. 31, 2016
Property and Equipment
Capitalized interest cost \| $	$ 49,600	$ 24,200	$ 25,300
Number of ships under capital leases \| ship	2			2
Principal and Interest payments received \| $	$ 124,238	62,303	38,213
Gain on sale of equipment \| $	$ 21,794	0	$ 0
Number of cruise ships \| ship	60			60
Pullmantur
Property and Equipment
Percentage of subsidiary which has been sold	51.00%		51.00%	51.00%			51.00%
Number of cruise ships \| ship	4		4	4
Maritime Equipment
Property and Equipment
Gain on sale of equipment \| $		$ 30,900
Wamos Air, S.A.
Property and Equipment
Number of aircraft sold \| aircraft		3
Percentage of ownership stake sold		6.00%
Number of loans extended \| loan		2
Notes receivable obtained from divestiture \| €						€ 17.3
Wamos Air, S.A.
Property and Equipment
Ownership percentage	13.00%			13.00%
Principal and Interest payments received \| $	$ 4,000
Receivable, related party	$ 16,100			€ 14.1
Minimum \| Wamos Air, S.A.
Property and Equipment
Long term debt, stated interest rate (as a percent)	4.78%			4.78%
Maximum \| Wamos Air, S.A.
Property and Equipment
Long term debt, stated interest rate (as a percent)	5.35%			5.35%
Silversea Cruises
Property and Equipment
Number of ships acquired \| ship	9			9	9
Number of ships under capital leases \| ship	2			2