Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2022 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maximum length of time hedged in derivative contract	3 years
Exchange gains (losses) recorded in other income (expense)	$ 93,000	$ 24,300	$ (1,500)
Derivative instrument, credit risk exposure	$ 103,300	$ 1,900
Number of operating segments | segment	1
Accounting Standards Update [Extensible Enumeration]		Accounting Standards Update 2020-06 [Member]
(Accumulated deficit) retained earnings	$ (1,707,429)	$ 302,276
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Long-term debt				$ 161,400
Decrease to additional paid in capital				307,600
(Accumulated deficit) retained earnings				$ 146,200
Media advertising
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Advertising costs	380,200	303,200	138,100
Brochure, production and direct mail costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Advertising costs	$ 129,400	$ 88,900	$ 69,100
Ships | Lower Limit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	30 years
Residual value, percentage	10.00%
Drydock services period	30 months
Ships | Upper Limit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	35 years
Residual value, percentage	15.00%
Drydock services period	60 months