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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 85,317 $ 131,708
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 15,366 13,402
Amortization of intangibles 11,307 9,093
Investment losses (gains), net 2,588 (2,496)
Impairment of minority investments 415 0
Stock-based compensation 12,464 16,419
Deferred income tax expense (benefit) (342) (4,592)
Retirement plan expense, net of benefit payments 637 847
Decrease (increase) in assets:    
Accounts receivable (6,251) (33,395)
Inventory (8,734) (25,261)
Other current assets 19,239 (19,777)
Other assets (1,445) (8,232)
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses (14,031) 4,632
Other current liabilities (147) (3,153)
Deferred revenue 19,892 4,618
Other liabilities (2,420) (1,315)
Net cash provided by operating activities 133,855 82,498
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (13,237) (27,536)
Purchase of intangibles (40,000) 0
Purchases of investments (194,296) (191,951)
Proceeds from sale and maturity of investments 264,483 185,000
Net cash provided by investing activities 16,950 (34,487)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 1,041 1,074
Repurchases of common stock, inclusive of excise tax (115,218) 0
Payment of withholding taxes related to stock-based compensation to employees (7,779) (9,442)
Cash dividends paid (46,639) (42,819)
Net cash used in financing activities (168,595) (51,187)
INCREASE IN CASH AND CASH EQUIVALENTS (17,790) (3,176)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 138,353 98,980
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 120,563 $ 95,804