CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 205,718	$ 291,545
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	172,944	165,701
Stock-based compensation expense	24,904	23,595
Deferred income taxes	(41)	18,688
Equity investment loss (income), net	664	(2,924)
Other non-cash charges, net	4,714	3,979
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:
Accounts receivable	(66,270)	(224,274)
Inventories	849	(5,303)
Other receivables and prepaid and other current assets	(17,966)	13,756
Other long-term assets	3,520	(6,521)
Accounts payable	21,402	(75,504)
Accrued compensation and benefits	(95,927)	(126,330)
Other current liabilities	26,912	26,970
Income taxes	52,473	62,719
Other long-term liabilities	(11,701)	(11,793)
Net cash provided by operating activities	322,195	154,304
Cash flows from investing activities:
Additions of property and equipment	(123,108)	(144,913)
Acquisitions	(5,166)	(3,668)
Proceeds from asset and business sales	11,353	16,337
Purchase of debt investments held-to-maturity	(5,070)	(5,349)
Purchase of other debt and equity investments	(2,726)	(1,779)
Proceeds from debt investments held-to-maturity	5,070	5,349
Proceeds from sale of other debt and equity investments	3,773	11,879
Purchase of equity method investments	(2,962)	(3,200)
Distributions from equity method investments	470	978
Net cash used in investing activities	(118,366)	(124,366)
Cash flows from financing activities:
Borrowings	354,285	1,606,969
Payments on long-term debt	(398,990)	(698,298)
Deferred financing and debt redemption costs	0	(8,346)
Purchase of treasury stock	(236,232)	(316,250)
Distributions to noncontrolling interests	(65,452)	(53,867)
Net payments related to stock purchases and awards	(501)	(2,524)
Contributions from noncontrolling interests	4,929	10,689
Proceeds from sales of additional noncontrolling interests	3,673	0
Purchases of noncontrolling interests	(3,283)	(1,095)
Net cash (used in) provided by financing activities	(341,571)	537,278
Effect of exchange rate changes on cash, cash equivalents and restricted cash	3,363	(7,966)
Net (decrease) increase in cash, cash equivalents and restricted cash	(134,379)	559,250
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 year	$ 420,581	$ 1,061,040