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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income $ 80,005 $ 79,930
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 75,748 75,866
Losses (gains) from sale of investments 2 (53)
Share-based compensation expense 53,924 51,079
Amortization of operating lease right-of-use assets 6,569 5,104
Deferred income tax benefit (39,665) (19,136)
Other 445 0
Changes in operating assets and liabilities, exclusive of effects of acquired companies:    
Accounts receivable (51,508) (73,396)
Income tax payable (41,762) 15,586
Prepaid expenses and other current assets (20,122) (6,033)
Accounts payable 13,721 9,130
Operating lease liabilities (5,324) (6,522)
Accrued liabilities (15,083) (24,723)
Deferred revenue (3,571) 17,474
Other long-term liabilities 2,146 5,914
Net cash provided by operating activities 55,525 130,220
Cash flows from investing activities:    
Additions to property and equipment (6,370) (12,757)
Purchase of marketable security investments (10,617) (4,592)
Proceeds and maturities from marketable security investments 37,107 40,595
Investment in software development (18,753) (16,463)
Cost of acquisitions, net of cash acquired (1,875) (117,313)
Other 16 152
Net cash used by investing activities (492) (110,378)
Cash flows from financing activities:    
Payment on term loans (120,000) (80,000)
Proceeds from exercise of stock options, net of withheld shares for taxes upon equity award settlement 2,123 (4,107)
Contributions from employee stock purchase plan 7,751 8,156
Net cash used by financing activities (110,126) (75,951)
Net decrease in cash and cash equivalents (55,093) (56,109)
Cash and cash equivalents at beginning of period 173,857 309,171
Cash and cash equivalents at end of period 118,764 253,062
Supplemental cash flow information:    
Cash paid for interest 12,286 5,716
Cash paid for income taxes, net 92,933 24,286
Non-cash investing and financing activities:    
Non-cash additions to property and equipment $ 368 $ 84