CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 448,752	$ 715,501	$ 1,014,589
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	92,118	90,763	91,073
Stock-based compensation	57,682	48,228	45,643
Provision for excess and obsolete inventory	28,358	31,452	15,475
Amortization	18,768	19,912	34,412
Retirement plans actuarial losses (gains)	2,703	(25,584)	(2,217)
Deferred taxes	(37,642)	(38,693)	(17,305)
(Gains) losses on investments	(14,915)	9,985	(6,410)
Gains on sale of asset	0	(3,410)	0
Loss on convertible debt conversion	0	0	28,828
Contingent consideration adjustment	0	0	(7,227)
Other	(955)	2,353	271
Changes in operating assets and liabilities, net of businesses acquired:
Accounts receivable	70,977	50,628	(57,778)
Inventories	5,327	(80,809)	6,495
Prepayments and other assets	(43,101)	(140,713)	(175,846)
Accounts payable and other accrued expenses	46,782	(60,507)	129,499
Deferred revenue and customer advances	(57,210)	(6,233)	9,873
Retirement plans contributions	(5,492)	(5,116)	(5,405)
Income taxes	(26,921)	(29,834)	(5,604)
Net cash provided by operating activities	585,231	577,923	1,098,366
Cash flows from investing activities:
Purchases of property, plant and equipment	(159,642)	(163,249)	(132,472)
Purchases of marketable securities	(161,906)	(287,409)	(661,781)
Proceeds from maturities of marketable securities	85,042	222,941	660,148
Proceeds from sales of marketable securities	61,401	268,058	266,466
Proceeds from insurance	460	0	0
Issuance of convertible loan	(5,000)	0	0
Proceeds from sale of asset	0	3,410	0
Purchase of investment and acquisition of business	0	0	(12,000)
Net cash (used for) provided by investing activities	(179,645)	43,751	120,361
Cash flows from financing activities:
Repurchase of common stock	(397,241)	(752,082)	(600,000)
Dividend payments	(67,878)	(69,711)	(65,977)
Payments of convertible debt principal	(50,264)	(66,759)	(342,990)
Payments related to net settlement of employee stock compensation awards	(20,788)	(33,170)	(32,303)
Issuance of common stock under stock purchase and stock option plans	34,259	28,733	32,686
Net cash used for financing activities	(501,912)	(892,989)	(1,008,584)
Effects of exchange rate changes on cash and cash equivalents	(876)	3,889	(2,065)
(Decrease) Increase in cash and cash equivalents	(97,202)	(267,426)	208,078
Cash and cash equivalents at beginning of year	854,773	1,122,199	914,121
Cash and cash equivalents at end of year	757,571	854,773	1,122,199
Cash paid for:
Interest	296	1,498	4,236
Income taxes	140,239	193,246	172,134
Non-cash investing activities:
Capital expenditures incurred but not yet paid:	$ 2,735	$ 1,826	$ 1,973