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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net income $ 133,163 $ 106,676
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 116,950 97,864
Losses from sale of investments 44 0
Share-based compensation expense 77,991 80,360
Operating lease right-of-use assets expense 9,240 7,016
Deferred income tax benefit (32,845) (15,681)
Changes in operating assets and liabilities, exclusive of effects of    acquired companies:    
Accounts receivable (34,163) 2,403
Income tax receivable 10,759 24,171
Prepaid expenses and other current assets (6,568) (10,456)
Accounts payable (13,750) (64,383)
Operating lease liabilities (9,324) (3,904)
Accrued liabilities (23,797) 4,817
Deferred revenue 20,592 29,609
Other long-term liabilities 11,306 (1,749)
Net cash provided by operating activities 259,598 256,743
Cash flows from investing activities:    
Additions to property and equipment (17,441) (20,770)
Purchase of marketable security investments (20,428) (75,684)
Proceeds and maturities from marketable security investments 55,052 114,563
Investment in software (25,557) (14,966)
Cost of acquisitions, net of cash acquired (117,706) (2,088,394)
Other 326 463
Net cash used by investing activities (125,754) (2,084,788)
Cash flows from financing activities:    
Net borrowings on revolving credit facility 0 0
Payment on term loans (270,000) (57,500)
Proceeds from term loans 0 900,000
Proceeds from issuance of convertible senior notes 0 600,000
Payment of debt issuance costs 0 (27,165)
Purchase of treasury shares 0 (12,975)
Proceeds from exercise of stock options, net of withheld shares for taxes upon equity award 298 46,433
Contributions from employee stock purchase plan 12,614 9,757
Net cash (used) provided by financing activities (257,088) 1,458,550
Net decrease in cash and cash equivalents (123,244) (369,495)
Cash and cash equivalents at beginning of period 309,171 603,623
Cash and cash equivalents at end of period $ 185,927 $ 234,128