CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net income	$ 218,653	$ 214,726
Adjustments:
Depreciation and amortization	240,230	235,749
Impairment loss related to Skysea Holding	23,343	0
Net deferred income tax (benefit) expense	(1,504)	610
Gain on derivative instruments not designated as hedges	(7,810)	(13,812)
Share-based compensation expense	20,164	17,262
Equity investment income	(28,752)	(11,880)
Amortization of debt issuance costs	10,108	13,256
Gain on sale of property and equipment	0	(30,902)
Changes in operating assets and liabilities:
Increase in trade and other receivables, net	(10,181)	(828)
Decrease in inventories	567	5,391
Increase in prepaid expenses and other assets	(89,725)	(32,083)
Increase in accounts payable	110,467	56,373
Increase in accrued interest	42,919	45,206
Decrease in accrued expenses and other liabilities	(109,136)	(57,344)
Increase in customer deposits	477,878	333,735
Dividends received from unconsolidated affiliates	37,918	27,997
Other, net	(11,017)	(6,930)
Net cash provided by operating activities	924,122	796,526
Investing Activities
Purchases of property and equipment	(1,720,232)	(122,783)
Cash received on settlement of derivative financial instruments	64,487	13,812
Cash received on loans to unconsolidated affiliates	13,953	5,011
Proceeds from the sale of property and equipment	0	230,000
Other, net	(3,353)	(2,440)
Net cash (used in) provided by investing activities	(1,645,145)	123,600
Financing Activities
Debt proceeds	2,544,737	1,006,000
Debt issuance costs	(41,344)	(10,383)
Repayments of debt	(1,394,222)	(1,840,402)
Purchases of treasury stock	(275,038)	0
Dividends paid	(127,840)	(102,942)
Proceeds from exercise of common stock options	3,863	2,100
Other, net	1,697	1,233
Net cash provided by (used in) financing activities	711,853	(944,394)
Effect of exchange rate changes on cash	303	974
Net decrease in cash and cash equivalents	(8,867)	(23,294)
Cash and cash equivalents at beginning of period	120,112	132,603
Cash and cash equivalents at end of period	111,245	109,309
Cash paid during the period for:
Interest, net of amount capitalized	$ 16,953	$ 24,296