Changes in Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain recognized					$ 6,620
Other operating expenses					2,765,108	$ 6,062,765	$ 5,262,207
Other operating
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating expenses					942,232	$ 1,405,698	$ 1,134,602
Foreign currency translation adjustments | Other operating | Reclassification out of accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating expenses	$ 69,044			$ 0	0
Pullmantur
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other expense					69,000
Deferred currency translation loss					92,600
Gain recognized					$ 23,600
Pullmantur | Foreign currency translation adjustments | Other operating | Reclassification out of accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating expenses		$ 34,700	$ 34,300