Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 382,410	$ 255,337
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	806,704	767,182
Stock-based compensation	174,413	139,849
Amortization of intangible assets	147,589	153,443
Amortization of debt issuance costs and debt discounts and premiums	9,429	10,609
Provision for allowance for doubtful accounts	8,588	4,886
Impairment charges	16,023	0
Gain on asset sales	(463)	(6,013)
Loss on debt extinguishment	67	39,214
Other items	9,909	13,040
Changes in operating assets and liabilities:
Accounts receivable	(123,389)	(85,126)
Income taxes, net	73,144	(32,876)
Other assets	(62,036)	(22,409)
Operating lease right-of-use assets	108,226
Operating lease liabilities	(112,059)
Accounts payable and accrued expenses	6,660	4,782
Other liabilities	17,843	14,879
Net cash provided by operating activities	1,463,058	1,256,797
Cash flows from investing activities:
Purchases of investments	(23,692)	(55,181)
Sales of investments	8,945	74,376
Business acquisitions, net of cash and restricted cash acquired	(34,143)	(829,185)
Purchases of real estate	(64,288)	(136,612)
Purchases of other property, plant and equipment	(1,364,960)	(1,415,509)
Proceeds from sale of assets, net of cash transferred	117	12,154
Net cash used in investing activities	(1,478,021)	(2,349,957)
Cash flows from financing activities:
Proceeds from employee equity awards	52,018	50,103
Payment of dividends and special distribution	(625,804)	(554,742)
Proceeds from public offering of common stock, net of issuance costs	1,660,976	273,873
Proceeds from senior notes	0	929,850
Proceeds from loans payable	0	424,650
Repayments of finance lease liabilities	(62,785)
Repayments of finance lease liabilities		(89,655)
Repayments of mortgage and loans payable	(53,796)	(429,498)
Repayment of senior notes	(150,000)	0
Debt extinguishment costs	0	(20,556)
Debt issuance costs	0	(12,218)
Net cash provided by financing activities	820,609	571,807
Effect of foreign currency exchange rates on cash, cash equivalents and restricted cash	(13,117)	(30,944)
Net increase (decrease) in cash, cash equivalents and restricted cash	792,529	(552,297)
Cash, cash equivalents and restricted cash at beginning of period	627,604	1,450,701
Cash, cash equivalents and restricted cash at end of period	1,420,133	898,404
Cash and cash equivalents	1,402,400	870,486
Current portion of restricted cash included in other current assets	7,988	17,287
Non-current portion of restricted cash included in other assets	$ 9,745	$ 10,631