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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 89,517 $ 91,472
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 13,207 11,529
Amortization of intangibles 6,885 11,000
Amortization of premium and discount on investments, net (6,845) (1,027)
Stock-based compensation to employees 10,479 14,282
Stock-based compensation to Board of Directors and Scientific Advisory Board 841 774
Deferred income tax benefit (12,782) (2,282)
Retirement plan expense, net of benefit payments 1,397 2,718
Decrease (increase) in assets:    
Accounts receivable (16,726) 32,706
Inventory 7,365 (31,475)
Other current assets 12,038 (17,296)
Other assets 7,665 7,522
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses (17,651) (7,126)
Other current liabilities (20,811) (3,343)
Deferred revenue (15,736) (27,954)
Other liabilities (1,445) 4,630
Net cash provided by operating activities 57,398 86,130
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (27,274) (21,336)
Purchases of intangibles (66,063) (12)
Purchases of investments (115,048) (287,919)
Proceeds from sale and maturity of investments 190,907 161,530
Net cash used in investing activities (17,478) (147,737)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 971 847
Payment of withholding taxes related to stock-based compensation to employees (7,429) (8,844)
Cash dividends paid (33,422) (28,493)
Net cash used in financing activities (39,880) (36,490)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 40 (98,097)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 93,430 311,993
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 93,470 $ 213,896