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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 467,468 | $ 451,779 | $ 257,692
Adjustments to reconcile net income from operations to net cash provided by operating activities: |  |  |
Depreciation | 70,834 | 67,415 | 66,122
Amortization | 49,821 | 45,809 | 41,953
Stock-based compensation | 37,897 | 33,577 | 34,097
Deferred taxes | (9,456) | 28,340 | 37,105
Provision for excess and obsolete inventory | 15,244 | 11,242 | 8,844
Investment impairment | 15,000 |  |
Contingent consideration fair value adjustment | (19,257) | 987 | 7,820
(Gains) losses on investments | (6,033) | 3,494 | (878)
Retirement plans actuarial losses (gains) | 8,176 | (3,316) | (6,624)
Property insurance recovery, net |  |  | (4,309)
Other | 766 | 1,083 | 1,585
Changes in operating assets and liabilities, net of businesses acquired: |  |  |
Accounts receivable | (70,440) | (17,938) | (80,584)
Inventories | (27,408) | (29,498) | 44,960
Prepayments and other assets | (23,784) | (58,402) | 2,254
Accounts payable and other liabilities | 49,279 | 13,693 | 43,574
Deferred revenue and customer advances | 39,313 | 13,379 | 4,984
Retirement plans contributions | (5,086) | (4,334) | (5,902)
Income taxes | (13,584) | (80,429) | 173,802
Net cash provided by operating activities | 578,750 | 476,881 | 626,495
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment | (134,642) | (114,379) | (105,375)
Proceeds from government subsidy for property, plant and equipment |  | 7,920 |
Purchases of marketable securities | (662,701) | (918,744) | (1,391,917)
Proceeds from maturities of marketable securities | 611,927 | 1,270,439 | 701,681
Proceeds from sales of marketable securities | 105,586 | 846,122 | 527,746
Proceeds from insurance | 2,912 | 1,126 | 5,064
Purchase of investment and acquisition of businesses, net of cash acquired | (79,742) | (169,474) |
Net cash (used for) provided by investing activities | (156,660) | 923,010 | (262,801)
Cash flows from financing activities: |  |  |
Issuance of common stock under stock purchase and stock option plans | 29,312 | 20,973 | 24,493
Repurchase of common stock | (500,000) | (823,478) | (200,304)
Dividend payments | (61,305) | (67,322) | (55,447)
Payments related to net settlement of employee stock compensation awards | (14,741) | (20,023) | (12,881)
Payments of contingent consideration | (27,615) | (13,571) | (1,050)
Net cash used for financing activities | (574,349) | (903,421) | (245,189)
Effects of exchange rate changes on cash and cash equivalents | (569) | 439 | 3,454
(Decrease) Increase in cash and cash equivalents | (152,828) | 496,909 | 121,959
Cash and cash equivalents at beginning of year | 926,752 | 429,843 | 307,884
Cash and cash equivalents at end of year | 773,924 | 926,752 | 429,843
Cash paid for: |  |  |
Interest | 5,996 | 6,205 | 6,446
Income taxes | $ 81,410 | $ 72,811 | $ 53,775

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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=26873400&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=118932676&loc=d3e3291-108585 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + 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=118932676&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=118932676&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=118954083&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=118932676&loc=d3e3213-108585 + Details
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