CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 222,079	$ 203,011	$ 210,061
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	25,940	27,409	24,815
Impairment of property and equipment and right-of-use asset due to OVJP restructuring	7,498	0	0
Amortization of intangibles	18,200	15,993	17,459
Amortization of premium and discount on investments, net	(7,399)	(11,603)	(6,461)
Impairment of minority investments	0	0	6,962
Stock-based compensation	30,032	24,109	29,946
Deferred income tax benefit	(19,117)	(3,766)	(26,946)
Retirement plan expense, net of benefit payments	1,808	3,129	5,276
Decrease (increase) in assets:
Accounts receivable	26,202	(47,186)	14,975
Inventory	(7,143)	7,425	(49,060)
Other current assets	(23,210)	(41,574)	(24,843)
Other assets	(2,968)	4,450	25,971
Increase (decrease) in liabilities:
Accounts payable and accrued expenses	10,357	4,047	3,338
Other current liabilities	1,269	(21,481)	20,917
Deferred revenue	(26,108)	(4,159)	(93,203)
Other liabilities	(3,700)	(5,027)	(32,392)
Net cash provided by operating activities	253,740	154,777	126,815
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(42,637)	(59,792)	(42,497)
Purchase of intangibles	0	(66,563)	(4,709)
Purchases of investments	(594,848)	(531,103)	(701,993)
Proceeds from sale and maturity of investments	473,075	574,165	468,456
Net cash used in investing activities	(164,410)	(83,293)	(280,743)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	2,220	2,012	1,570
Payment of withholding taxes related to stock-based compensation to employees	(8,386)	(8,206)	(9,209)
Cash dividends paid	(76,169)	(66,735)	(56,996)
Net cash used in financing activities	(82,335)	(72,929)	(64,635)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	6,995	(1,445)	(218,563)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	91,985	93,430	311,993
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 98,980	$ 91,985	$ 93,430