Other Assets - Share of Equity Income From Investments (Details) € in Millions		3 Months Ended
		Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 EUR (€)
Schedule of Investments [Line Items]
Share of equity (loss) income from investments		$ (10,392,000)	$ 33,694,000
Dividends received	[1]	1,991,000	$ 42,435,000
TUI Cruises
Schedule of Investments [Line Items]
Dividends received		$ 0		€ 50.0

[1] There were no dividends received from TUI Cruises for the quarter ended March 31, 2020. For the quarter ended March 31, 2019, amount includes dividends of €50.0 million from TUI Cruises, net of tax withholdings