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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 131,708 $ 109,190
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 13,402 13,092
Amortization of intangibles 9,093 9,097
Amortization of premium and discount on investments, net (2,496) (4,276)
Stock-based compensation 16,419 18,523
Deferred income tax benefit (4,592) (7,402)
Retirement plan expense, net of benefit payments 847 962
Decrease (increase) in assets:    
Accounts receivable (33,395) 15,464
Inventory (25,261) 3,952
Other current assets (19,777) (45,364)
Other assets (8,232) 6,444
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses 4,632 12,367
Other current liabilities (3,153) (2,141)
Deferred revenue 4,618 10,797
Other liabilities (1,315) (1,536)
Net cash provided by operating activities 82,498 139,169
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (27,536) (16,334)
Purchases of investments (191,951) (174,757)
Proceeds from sale and maturity of investments 185,000 97,620
Net cash used in investing activities (34,487) (93,471)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 1,074 1,187
Payment of withholding taxes related to stock-based compensation to employees (9,442) (7,329)
Cash dividends paid (42,819) (38,685)
Net cash used in financing activities (51,187) (44,827)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (3,176) 871
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 98,980 91,985
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 95,804 $ 92,856