Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities
Net income	$ 90,048	$ 181,222
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	70,206	53,701
Stock-based compensation expense	86,862	58,323
Deferred income tax expense (benefit)	6,929	(5,575)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	10,771	2,794
Other non-cash items	(13,118)	7,871
Total adjustments to reconcile net income to net cash provided by operating activities	161,650	117,114
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	302,824	11,314
Inventories	(1,357)	(1,944)
Prepaid expenses and other current assets	(18,416)	(7,029)
Other assets	(27,533)	(23,277)
Income taxes, net	(38,020)	7,011
Accounts payable	24,856	20,529
Accrued expenses and other current liabilities	(190,809)	17,149
Deferred revenues	(92,145)	(40,989)
Other liabilities	1,758	3,147
Total changes in operating assets and liabilities, net of the effects of acquisitions	(38,842)	(14,089)
Net cash provided by operating activities	212,856	284,247
Investing Activities
Purchases of available-for-sale investments	(2,561)	(4,420)
Proceeds from maturities of available-for-sale investments	108,761	25,755
Purchases of property and equipment	(23,894)	(10,503)
Cash paid for acquisitions, net of cash acquired	(2,022,618)	0
Cash paid for licensing agreements, patents and technology	(2,065)	(1,682)
Other	776	884
Net cash (used in) provided by investing activities	(1,941,601)	10,034
Financing Activities
Proceeds from term loan credit agreement, net of issuance costs	997,947	998,846
Repayment of term loan credit agreement	0	(750,000)
Proceeds from senior notes, net of issuance costs	741,393	738,107
Repayment of acquired debt	(190,000)	0
Stock repurchases, net	0	(999,903)
Accelerated stock repurchase program	0	(200,000)
Cash paid for tax withholding on vested stock awards	(42,303)	(54,247)
Cash paid for dividends	(45,522)	(42,839)
Other	(5,438)	0
Net cash provided by (used in) financing activities	1,456,077	(310,036)
Effect of exchange rate changes on cash and cash equivalents	(2,484)	(5,125)
Change in cash and cash equivalents	(275,152)	(20,880)
Cash and cash equivalents at beginning of period	752,895	545,761
Cash and cash equivalents at end of period	$ 477,743	$ 524,881