Other Assets - Share of Equity Income From Investments (Details) $ in Thousands, € in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2018 USD ($)
Schedule of Investments [Line Items]
Share of equity income from investments		$ 103,654		$ 95,169	$ 170,393		$ 168,232
Dividends received	[1]	67,713		$ 82,755	148,285		$ 241,697
TUI Cruises
Schedule of Investments [Line Items]
Dividends received	[1]	$ 88,500	€ 80.0		$ 190,300	€ 170.0

[1] For the quarter ended September 30, 2019, TUI Cruises paid us dividends of €80.0 million, or approximately $88.5 million, based on the exchange rate at the time of the transactions. For the nine months ended September 30, 2019, TUI Cruises paid us dividends totaling €170.0 million, or approximately $190.3 million, based on the exchange rates at the time of the transactions. The amounts included in the table above are net of tax withholdings.