CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 490,334	$ 642,576
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	344,120	335,390
Stock-based compensation expense	50,109	51,717
Deferred income taxes	9,069	40,685
Equity investment loss (income), net	90	(2,764)
Other non-cash charges, net	(32,858)	1,274
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:
Accounts receivable	(132,043)	(117,171)
Inventories	(1,927)	(3,270)
Other receivables and prepaid and other current assets	(61,811)	14,465
Other long-term assets	(49,093)	(13,706)
Accounts payable	24,517	(47,390)
Accrued compensation and benefits	(102,513)	(90,381)
Other current liabilities	42,517	25,090
Income taxes	(63,638)	10,753
Other long-term liabilities	(6,557)	(13,232)
Net cash provided by operating activities	510,316	834,036
Cash flows from investing activities:
Additions of property and equipment	(265,461)	(294,438)
Acquisitions	(9,491)	(23,890)
Proceeds from asset and business sales	114,829	29,774
Purchase of debt investments held-to-maturity	(89,530)	(7,923)
Purchase of other debt and equity investments	(3,010)	(2,164)
Proceeds from debt investments held-to-maturity	8,415	7,923
Proceeds from sale of other debt and equity investments	3,775	11,908
Purchase of equity method investments	(23,806)	(6,029)
Distributions from equity method investments	1,047	1,140
Net cash used in investing activities	(263,232)	(283,699)
Cash flows from financing activities:
Borrowings	1,182,911	1,611,086
Payments on long-term debt	(841,687)	(754,407)
Deferred financing and debt redemption costs	0	(9,089)
Purchase of treasury stock	(617,432)	(560,507)
Distributions to noncontrolling interests	(118,315)	(99,362)
Net payments related to stock purchases and awards	(47,866)	(43,605)
Contributions from noncontrolling interests	9,116	15,925
Proceeds from sales of additional noncontrolling interests	3,673	0
Purchases of noncontrolling interests	(15,365)	(4,493)
Net cash (used in) provided by financing activities	(444,965)	155,548
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,342)	(1,197)
Net (decrease) increase in cash, cash equivalents and restricted cash	(199,223)	704,688
Cash, cash equivalents and restricted cash at beginning of the year	554,960	501,790
Cash, cash equivalents and restricted cash at end of the period	$ 355,737	$ 1,206,478