Other Assets - Share of Equity Income From Investments (Details) $ in Thousands, € in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)	Jun. 30, 2018 USD ($)
Schedule of Investments [Line Items]
Share of equity income from investments		$ 33,045		$ 44,311	$ 66,739		$ 73,063
Dividends received	[1]	38,137		$ 121,024	80,572		$ 158,942
TUI Cruises
Schedule of Investments [Line Items]
Dividends received	[1]	$ 45,600	€ 40.0		$ 101,800	€ 90.0

[1] For the quarter ended June 30, 2019, TUI Cruises paid us a dividend of €40.0 million, or approximately $45.6 million, based on the exchange rate at the time of the transaction. For the six months ended June 30, 2019, TUI Cruises paid us dividends totaling €90.0 million, or approximately $101.8 million, based on the exchange rates at the time of the transactions. The amounts included in the table above are net of tax withholdings.