Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flow from operating activities:
Net income	$ 138,923	$ 103,555
Adjustments to reconcile net income to net cash provided by operating activities:
Disposal gain on sale of business/asset	(159,753)	(26,842)
Depreciation and amortization	61,228	54,546
Stock-based compensation	42,556	38,054
Deferred income taxes	(932)	(1,461)
Changes in operating assets and liabilities	26,762	(18,507)
Net cash provided by operating activities	108,784	149,345
Cash flow from investing activities:
Acquisitions, net of cash acquired	(334,981)	0
Capital expenditures	(36,573)	(47,183)
Proceeds from sale of assets/business, net of cash divested	160,266	32,492
Capitalization of internally developed software	(2,806)	(7,179)
Additions to other intangibles	(1,045)	(1,132)
Acquisitions of equity-method investments	(7,502)	(13,670)
Purchases of short-term investments	(206,330)	(141,074)
Sales and maturities of short-term investments	351,597	204,046
Net cash (used in) provided by investing activities	(77,374)	26,300
Cash flow from financing activities:
Proceeds from revolving line of credit	20,000	0
Proceeds from term loan	70,000	0
Payments on term loan	(875)	0
Debt issuance costs	(1,480)	0
Proceeds from issuance of common stock	24,971	25,823
Repurchase of common stock	(39,244)	(137,171)
Dividends paid	(102,396)	(99,083)
Net cash used in financing activities	(29,024)	(210,431)
Effect of exchange rate changes on cash	317	(1,827)
Net change in cash and cash equivalents	2,703	(36,613)
Cash and cash equivalents at beginning of period	194,616	259,386
Cash and cash equivalents at end of period	$ 197,319	$ 222,773