CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)		Dec. 31, 2015 USD ($)
Operating Activities
Net income	$ 1,625,133		$ 1,283,388		$ 665,783
Adjustments:
Depreciation and amortization	951,194		894,915		827,008
Impairment of Pullmantur related assets	0		0		411,267
Net deferred income tax expense (benefit)	1,730		2,608		(10,001)
Share-based compensation expense	69,459		32,659		36,073
Equity investment income	(156,247)		(128,350)		(81,026)
Amortization of debt issuance costs	45,943		52,795		52,153
Gain on sale of property and equipment	(30,902)		0		0
(Gain) loss on derivative instruments not designated as hedges	(61,704)		45,670		59,162
Changes in operating assets and liabilities:
(Increase) decrease in trade and other receivables, net	(32,043)		4,759		63,102
Decrease (increase) in inventories	2,424		(1,679)		1,197
Decrease (increase) in prepaid expenses and other assets	20,859		11,519		(2,262)
Increase (decrease) in accounts payable	36,780		29,564		(25,278)
Increase (decrease) in accrued interest	1,303		7,841		(10,749)
Increase in accrued expenses and other liabilities	34,215		20,718		33,859
Increase (decrease) in customer deposits	274,705		188,632		(92,849)
Dividends received from unconsolidated affiliates	109,677		75,942		33,338
Other, net	(17,960)		(4,291)		(14,411)
Net cash provided by operating activities	2,874,566		2,516,690		1,946,366
Investing Activities
Purchases of property and equipment	(564,138)		(2,494,363)		(1,613,340)
Cash received (paid) on settlement of derivative financial instruments	63,224		(213,202)		(178,597)
Investments in and loans to unconsolidated affiliates	(10,396)		(9,155)		(56,163)
Cash received on loans to unconsolidated affiliates	62,303		38,213		124,253
Proceeds from sale of property and equipment	230,000		0		0
Other, net	5,415	[1]	(46,385)	[1]	(19,128)	[1]
Net cash used in investing activities	(213,592)		(2,724,892)		(1,742,975)
Financing Activities
Debt proceeds	5,866,966		7,338,560		4,399,501
Debt issuance costs	(51,590)		(88,241)		(68,020)
Repayments of debt	(7,835,087)		(6,365,570)		(4,118,553)
Purchase of treasury stock	(224,998)		(299,960)		(200,000)
Dividends paid	(437,455)		(346,487)		(280,212)
Proceeds from exercise of common stock options	2,525		2,258		11,252
Other, net	3,843		3,249		2,520
Net cash (used in) provided by financing activities	(2,675,796)		243,809		(253,512)
Effect of exchange rate changes on cash	2,331		(24,569)		(17,555)
Net (decrease) increase in cash and cash equivalents	(12,491)		11,038		(67,676)
Cash and cash equivalents at beginning of year	132,603		121,565		189,241
Cash and cash equivalents at end of year	120,112		132,603		121,565
Cash paid during the year for:
Interest, net of amount capitalized	249,615		256,775		248,611
Non-Cash Investing Activities
Purchases of property and equipment included in accounts payable and accrued expenses and other liabilities	139,644		0		0
Notes receivable issued upon sale of property and equipment	$ 20,409		213,042		$ 0
Divestiture of Pullmantur Holdings			$ 26,000

[1] Amount includes $26.0 million in 2016 related to cash included in the divestiture of Pullmantur Holdings.