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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:      
Net income $ 715,501 $ 1,014,589 $ 784,147
Adjustments to reconcile net income from operations to net cash provided by operating activities:      
Depreciation 90,763 91,073 80,119
Stock-based compensation 48,228 45,643 44,906
Provision for excess and obsolete inventory 31,452 15,475 17,534
Amortization 19,912 34,412 46,624
Deferred taxes (38,693) (17,305) (15,688)
Retirement plans actuarial (gains) losses (25,584) (2,217) 10,284
Losses (gains) on investments 9,985 (6,410) (7,898)
Gains on sale of asset (3,410) 0 0
Loss on convertible debt conversion 0 28,828 0
Contingent consideration adjustment 0 (7,227) (23,271)
Other 2,353 271 1,557
Changes in operating assets and liabilities, net of businesses acquired:      
Accounts receivable 50,628 (57,778) (129,451)
Inventories (80,809) 6,495 (8,438)
Prepayments and other assets (140,713) (175,846) (64,418)
Accounts payable and other accrued expenses (60,507) 129,499 73,167
Deferred revenue and customer advances (6,233) 9,873 39,974
Retirement plans contributions (5,116) (5,405) (5,382)
Income taxes (29,834) (5,604) 25,169
Net cash provided by operating activities 577,923 1,098,366 868,935
Cash flows from investing activities:      
Purchases of property, plant and equipment (163,249) (132,472) (184,977)
Purchases of marketable securities (287,409) (661,781) (900,196)
Proceeds from maturities of marketable securities 222,941 660,148 479,678
Proceeds from sales of marketable securities 268,058 266,466 35,006
Proceeds from sale of asset 3,410 0 0
Purchase of investment and acquisition of business 0 (12,000) 149
Proceeds from life insurance 0 0 546
Net cash provided by (used for) investing activities 43,751 120,361 (569,794)
Cash flows from financing activities:      
Repurchase of common stock (752,082) (600,000) (88,465)
Payments of convertible debt principal (66,759) (342,990) 0
Issuance of common stock under stock purchase and stock option plans 28,733 32,686 28,527
Dividend payments (69,711) (65,977) (66,482)
Payments related to net settlement of employee stock compensation awards (33,170) (32,303) (23,014)
Payments of contingent consideration 0 0 (8,852)
Net cash used for financing activities (892,989) (1,008,584) (158,286)
Effects of exchange rate changes on cash and cash equivalents 3,889 (2,065) (658)
(Decrease) Increase in cash and cash equivalents (267,426) 208,078 140,197
Cash and cash equivalents at beginning of year 1,122,199 914,121 773,924
Cash and cash equivalents at end of year 854,773 1,122,199 914,121
Cash paid for:      
Interest 1,498 4,236 6,435
Income taxes 193,246 172,134 106,577
Non-cash investing activities:      
Capital expenditures incurred but not yet paid: $ 1,826 $ 1,973 $ 3,666