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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income $ 784,147 $ 467,468 $ 451,779
Adjustments to reconcile net income from operations to net cash provided by operating activities:      
Depreciation 80,119 70,834 67,415
Amortization 46,624 49,821 45,809
Stock-based compensation 44,906 37,897 33,577
Provision for excess and obsolete inventory 17,534 15,244 11,242
Retirement plans actuarial losses (gains) 10,284 8,176 (3,316)
Contingent consideration adjustment (23,271) (19,257) 987
Deferred taxes (15,688) (9,456) 28,340
(Gains) losses on investments (7,898) (6,033) 3,494
Investment impairment   15,000  
Other 1,557 766 1,083
Changes in operating assets and liabilities, net of businesses acquired:      
Accounts receivable (129,451) (70,440) (17,938)
Inventories (8,438) (27,408) (29,498)
Prepayments and other assets (64,418) (23,784) (58,402)
Accounts payable and other accrued expenses 73,167 49,279 13,693
Deferred revenue and customer advances 39,974 39,313 13,379
Retirement plans contributions (5,382) (5,086) (4,334)
Income taxes 25,169 (13,584) (80,429)
Net cash provided by operating activities 868,935 578,750 476,881
Cash flows from investing activities:      
Purchases of property, plant and equipment (184,977) (134,642) (114,379)
Proceeds from government subsidy for property, plant and equipment     7,920
Purchases of marketable securities (900,196) (662,701) (918,744)
Proceeds from maturities of marketable securities 479,678 611,927 1,270,439
Proceeds from sales of marketable securities 35,006 105,586 846,122
Proceeds from life insurance 546 2,912 1,126
Purchase of investment and acquisition of businesses, net of cash acquired 149 (79,742) (169,474)
Net cash (used for) provided by investing activities (569,794) (156,660) 923,010
Cash flows from financing activities:      
Issuance of common stock under stock purchase and stock option plans 28,527 29,312 20,973
Repurchase of common stock (88,465) (500,000) (823,478)
Dividend payments (66,482) (61,305) (67,322)
Payments related to net settlement of employee stock compensation awards (23,014) (14,741) (20,023)
Payments of contingent consideration (8,852) (27,615) (13,571)
Net cash (used for) provided by financing activities (158,286) (574,349) (903,421)
Effects of exchange rate changes on cash and cash equivalents (658) (569) 439
Increase (decrease) in cash and cash equivalents 140,197 (152,828) 496,909
Cash and cash equivalents at beginning of year 773,924 926,752 429,843
Cash and cash equivalents at end of year 914,121 773,924 926,752
Cash paid for:      
Interest 6,435 5,996 6,205
Income taxes 106,577 81,410 72,811
Non-cash investing activities:      
Capital expenditures incurred but not yet paid: $ 3,666 $ 4,068 $ 2,537