CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total revenues	$ 2,796,187	$ 2,569,544	$ 7,161,548	$ 6,773,378
Cruise operating expenses:
Total cruise operating expenses	1,411,364	1,318,269	3,901,794	3,750,878
Marketing, selling and administrative expenses	325,167	273,637	975,451	874,957
Depreciation and amortization expenses	259,923	240,150	753,529	710,836
Operating Income	799,733	737,488	1,530,774	1,436,707
Other income (expense):
Interest income	5,831	4,693	26,662	16,756
Interest expense, net of interest capitalized	(86,510)	(73,233)	(236,252)	(230,182)
Equity investment income	95,169	85,120	168,232	120,359
Other expense	(3,832)	(1,226)	5,923	(6,546)
Total other income (expense)	10,658	15,354	(35,435)	(99,613)
Net Income	$ 810,391	$ 752,842	$ 1,495,339	$ 1,337,094
Earnings per Share:
Basic (in dollars per share)	$ 3.88	$ 3.51	$ 7.08	$ 6.22
Diluted (in dollars per share)	$ 3.86	$ 3.49	$ 7.05	$ 6.19
Weighted-Average Shares Outstanding:
Basic (in shares)	209,054	214,694	211,099	214,882
Diluted (in shares)	209,928	215,824	211,973	215,905
Comprehensive Income
Net Income	$ 810,391	$ 752,842	$ 1,495,339	$ 1,337,094
Other comprehensive income (loss):
Foreign currency translation adjustments	(3,479)	5,889	(13,840)	14,210
Change in defined benefit plans	1,153	(1,990)	6,949	(6,280)
Gain on cash flow derivative hedges	36,946	230,245	110,576	381,660
Total other comprehensive income	34,620	234,144	103,685	389,590
Comprehensive Income	845,011	986,986	1,599,024	1,726,684
Passenger ticket revenues
Total revenues	2,042,911	1,893,152	5,141,125	4,892,760
Onboard and other revenues
Total revenues	753,276	676,392	2,020,423	1,880,618
Cruise operating expenses:
Total cruise operating expenses	171,028	157,041	412,805	395,472
Commissions, transportation and other
Cruise operating expenses:
Total cruise operating expenses	430,039	409,597	1,078,953	1,060,176
Payroll and related
Cruise operating expenses:
Total cruise operating expenses	221,205	210,764	674,676	636,861
Food
Cruise operating expenses:
Total cruise operating expenses	133,324	126,223	381,349	369,198
Fuel
Cruise operating expenses:
Total cruise operating expenses	182,415	160,752	515,065	508,914
Other operating
Cruise operating expenses:
Total cruise operating expenses	$ 273,353	$ 253,892	$ 838,946	$ 780,257