Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Cash flows from operating activities
Net income	$ 725,983	$ 601,822	$ 563,648
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	80,592	56,941	49,410
Stock-based compensation expense	54,917	51,094	41,199
Depreciation and amortization of property, equipment and leasehold improvements	28,901	29,805	29,999
Amortization of right of use assets	24,632	24,049	22,489
Loss on impairment of right of use assets	8,385
Amortization of debt origination fees	4,923	4,445	4,073
Loss on extinguishment of debt	59,103	44,930	16,794
Deferred taxes	(111,369)	(55,645)	(20,767)
Other adjustments	(146)	1,744	1,093
Changes in assets and liabilities, net of the effect of acquisitions and dispositions:
Accounts receivable	(99,203)	(57,606)	(25,923)
Prepaid income taxes	15,264	11,608	(13,200)
Prepaid and other assets	(4,240)	(410)	(7,698)
Other non-current assets	(35,445)	(3,792)	(239)
Accounts payable	(2,195)	7,482	2,584
Income taxes payable	33,903	9,576	(2,240)
Accrued compensation and related benefits	42,719	(2,641)	25,217
Other accrued liabilities	(9,249)	1,674	3,664
Deferred revenue	116,863	98,330	35,366
Long-term operating lease liabilities	(22,078)	(22,497)	(20,244)
Other non-current liabilities	21,536	6,536	3,851
Other	2,273	3,664	447
Net cash provided by operating activities	936,069	811,109	709,523
Cash flows from investing activities
Acquisition of a business, net of cash acquired	(948,989)		(18,177)
Acquisition of equity method investment	(26,361)	(190,816)
Acquisition of assets, net of cash acquired	(6,512)
Capital expenditures	(13,509)	(21,826)	(29,116)
Capitalized software development costs	(39,285)	(29,149)	(24,654)
Other	(1,057)		10
Net cash used in investing activities	(1,035,713)	(241,791)	(71,937)
Cash flows from financing activities
Proceeds from borrowings, inclusive of premium	1,803,750	1,405,000	1,000,000
Repayment of borrowings	(1,051,810)	(1,142,382)	(513,125)
Repurchase of common stock held in treasury	(198,374)	(778,519)	(292,075)
Payment of dividends	(302,449)	(246,444)	(222,922)
Payment of debt issuance costs in connection with debt	(21,612)	(16,693)	(11,781)
Proceeds from exercise of stock options			3,236
Net cash provided by (used in) financing activities	229,505	(779,038)	(36,667)
Effect of exchange rate changes	(8,933)	3,674	1,472
Net (decrease) increase in cash	120,928	(206,046)	602,391
Cash and cash equivalent, beginning of period	1,300,521	1,506,567	904,176
Cash and cash equivalent, end of period	1,421,449	1,300,521	1,506,567
Supplemental disclosure of cash flow information:
Cash paid for interest	151,335	163,391	141,484
Cash paid for income taxes, net of refunds received	222,620	113,646	72,935
Supplemental disclosure of non-cash investing activities
Property, equipment and leasehold improvements in other accrued liabilities	3,498	3,061	3,690
Supplemental disclosure of non-cash financing activities
Cash dividends declared, but not yet paid	$ 2,599	$ 1,438	$ 1,039