Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 252,307	$ 261,599
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	586,609	533,650
Stock-based compensation	140,343	110,542
Amortization of intangible assets	97,853	98,752
Amortization of debt issuance costs and debt discounts and premiums	7,904	6,233
Provision for allowance for doubtful accounts	11,496	7,097
Impairment charges	0	14,834
Loss on asset sales	857	0
Loss on debt extinguishment	8,309	382
Other items	10,654	8,725
Changes in operating assets and liabilities:
Accounts receivable	(14,233)	(126,720)
Income taxes, net	11,861	30,662
Other assets	(60,019)	(5,724)
Operating lease right-of-use assets	76,292	78,483
Operating lease liabilities	(72,091)	(73,805)
Accounts payable and accrued expenses	(25,564)	(3,987)
Other liabilities	58,938	23,341
Net cash provided by operating activities	1,091,516	964,064
Cash flows from investing activities:
Purchases of investments	(52,415)	(20,787)
Sales of investments	12,134	8,945
Business acquisitions, net of cash and restricted cash acquired	(478,248)	(34,143)
Purchases of real estate	(82,567)	(47,436)
Purchases of other property, plant and equipment	(882,889)	(808,138)
Net cash used in investing activities	(1,483,985)	(901,559)
Cash flows from financing activities:
Proceeds from employee equity awards	30,391	27,593
Payment of dividends and special distribution	(469,487)	(413,052)
Proceeds from public offering of common stock, net of issuance costs	1,784,898	1,561,555
Proceeds from senior notes, net of debt discounts	2,585,736	0
Proceeds from mortgage and loans payable	750,790	0
Repayments of finance lease liabilities	(42,681)	(43,112)
Repayments of mortgage and loans payable	(789,178)	(36,212)
Repayment of senior notes	(493,711)	(150,000)
Debt extinguishment costs	(4,619)	0
Debt issuance costs	(26,266)	0
Net cash provided by financing activities	3,325,873	946,772
Effect of foreign currency exchange rates on cash, cash equivalents and restricted cash	(12,876)	411
Net increase in cash, cash equivalents and restricted cash	2,920,528	1,009,688
Cash, cash equivalents and restricted cash at beginning of period	1,886,613	627,604
Cash, cash equivalents and restricted cash at end of period	4,807,141	1,637,292
Total cash, cash equivalents, and restricted cash shown in the condensed consolidated statement of cash flows	$ 4,807,141	$ 1,637,292