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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:      
Net income $ 315,603 $ 263,026 $ 165,919
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 138,358 143,437 154,079
Gains (losses) from sale of investments (8) 24 1
Share-based compensation expense 151,276 122,813 108,338
Provision (reductions in allowance) for losses and sales adjustments - accounts receivable 14,647 (5,504) 8,233
Amortization of operating lease right-of-use assets 9,506 8,932 16,688
Deferred income tax provision (benefit) 43,851 (30,663) (73,704)
Other 80 207 475
Changes in operating assets and liabilities, exclusive of effects of acquired companies:      
Accounts receivable (61,688) 28,795 (39,878)
Income tax receivable (12,001) (14,441) (41,201)
Prepaid expenses and other current assets (18,884) (29,775) (19,668)
Accounts payable 17,836 10,509 41,485
Operating lease liabilities (11,146) (11,650) (11,533)
Accrued liabilities (3,336) 43,387 13,069
Deferred revenue 70,291 90,775 58,513
Other long-term liabilities (842) 4,761 (376)
Net cash provided by operating activities 653,543 624,633 380,440
Cash flows from investing activities:      
Additions to property and equipment (16,015) (20,535) (20,519)
Purchase of marketable security investments (228,465) (32,448) (10,617)
Proceeds and maturities from marketable security investments 121,890 15,994 49,412
Investment in software development (16,778) (29,401) (32,490)
Cost of acquisitions, net of cash acquired (83,652) (1,395) (62,759)
Other 526 173 13
Net cash used by investing activities (222,494) (67,612) (76,960)
Cash flows from financing activities:      
Payment on term loans 0 (50,000) (345,000)
Payment of debt issuance costs 0 (2,637) 0
Purchase of treasury shares 174,650 0 0
Proceeds from exercise of stock options, net of withheld shares for taxes upon equity award settlement 3,144 57,213 16,960
Contributions from employee stock purchase plan 18,848 17,631 16,196
Other (7,712) 0 0
Net cash (used) provided by financing activities (160,370) 22,207 (311,844)
Net increase (decrease) in cash and cash equivalents 270,679 579,228 (8,364)
Cash and cash equivalents at beginning of period 744,721 165,493 173,857
Cash and cash equivalents at end of period 1,015,400 744,721 165,493
Supplemental cash flow information:      
Cash paid for interest 2,164 3,095 19,154
Cash paid for income taxes, net 40,761 84,204 142,820
Non-cash investing and financing activities:      
Non-cash additions to property and equipment 312 254 3,123
Issuance of shares for acquisitions $ 0 $ 0 $ 5,675