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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

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- Definition Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The net cash outflow or inflow for net proceeds and payments derived from carrying life insurance policies for which the entity is the beneficiary. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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