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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 175,733 $ 176,060
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 20,932 19,488
Amortization of Intangible Assets 13,646 13,648
Investment gains, net (6,630) (5,930)
Stock-based compensation 22,888 23,812
Deferred income tax expense (benefit) 977 (12,878)
Retirement plan expense, net of benefit payments 1,271 1,385
Decrease (increase) in assets:    
Accounts receivable 39,434 52,157
Inventory (29,683) (163)
Other current assets (36,928) (39,278)
Other assets (12,364) (4,397)
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses 304 9,405
Other current liabilities (2,406) (1,977)
Deferred revenue (8,763) (9,950)
Other liabilities 1,270 (2,355)
Net cash provided by operating activities 179,681 219,027
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (40,383) (29,960)
Purchases of investments (319,593) (337,949)
Proceeds from sale and maturity of investments 275,000 200,768
Net cash used in investing activities (84,976) (167,141)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 1,617 1,776
Payment of withholding taxes related to stock-based compensation to employees (9,470) (8,251)
Cash dividends paid (64,223) (57,837)
Net cash used in financing activities (72,076) (64,312)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS 22,629 (12,426)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 98,980 91,985
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 121,609 $ 79,559