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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net income $ 79,930 $ 62,506
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 75,866 60,976
Gains from sale of investments (53) 0
Share-based compensation expense 51,079 50,899
Operating lease right-of-use assets expense 5,104 4,034
Deferred income tax benefit (19,136) (6,430)
Changes in operating assets and liabilities, exclusive of effects of    acquired companies:    
Accounts receivable (73,396) (46,312)
Income tax receivable 15,586 7,276
Prepaid expenses and other current assets (6,033) (10,434)
Accounts payable 9,130 (57,471)
Operating lease liabilities (6,522) (4,361)
Accrued liabilities (24,723) (30,217)
Deferred revenue 17,474 20,868
Other long-term liabilities 5,914 22
Net cash provided by operating activities 130,220 51,356
Cash flows from investing activities:    
Additions to property and equipment (12,757) (14,223)
Purchase of marketable security investments (4,592) (68,054)
Proceeds and maturities from marketable security investments 40,595 91,395
Investment in software (16,463) (8,947)
Cost of acquisitions, net of cash acquired (117,313) (1,998,902)
Other 152 39
Net cash used by investing activities (110,378) (1,998,692)
Cash flows from financing activities:    
Net borrowings on revolving credit facility 0 65,000
Payment on term loans (80,000) 0
Proceeds from term loans 0 900,000
Proceeds from issuance of convertible senior notes 0 600,000
Payment of debt issuance costs 0 (27,127)
Purchase of treasury shares 0 (12,975)
Proceeds from exercise of stock options, net of withheld shares for taxes upon equity award (4,107) 29,388
Contributions from employee stock purchase plan 8,156 6,200
Net cash (used) provided by financing activities (75,951) 1,560,486
Net decrease in cash and cash equivalents (56,109) (386,850)
Cash and cash equivalents at beginning of period 309,171 603,623
Cash and cash equivalents at end of period $ 253,062 $ 216,773