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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 176,060 $ 141,033
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 19,488 20,128
Amortization of intangibles 13,648 11,442
Amortization of premium and discount on investments, net (5,930) (9,436)
Stock-based compensation 23,812 18,623
Deferred income tax (benefit) expense (12,878) 7,556
Retirement plan expense, net of benefit payments 1,385 2,347
Decrease (increase) in assets:    
Accounts receivable 52,157 (29,528)
Inventory (163) 1,814
Other current assets (39,278) (37,653)
Other assets (4,397) 8,292
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses 9,405 (32)
Other current liabilities (1,977) (24,186)
Deferred revenue (9,950) 11,809
Other liabilities (2,355) (4,502)
Net cash provided by operating activities 219,027 117,707
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (29,960) (52,208)
Purchases of intangibles 0 (66,563)
Purchases of investments (337,949) (303,004)
Proceeds from sale and maturity of investments 200,768 346,407
Net cash used in investing activities (167,141) (75,368)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 1,776 1,532
Payment of withholding taxes related to stock-based compensation to employees (8,251) (7,895)
Cash dividends paid (57,837) (50,083)
Net cash used in financing activities (64,312) (56,446)
DECREASE IN CASH AND CASH EQUIVALENTS (12,426) (14,107)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 91,985 93,430
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 79,559 $ 79,323