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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 | $ 377,778 | $ 425,521 | $ 410,573
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
(Gain) loss on sale of fixed assets - net | (868) | 156 | 946
Asset impairments | 3,087 | 10,155 | 0
Depreciation and amortization | 41,651 | 39,543 | 39,049
Amortization of intangible assets | 41,844 | 37,333 | 38,495
Amortization of debt issuance expenses | 1,716 | 1,355 | 1,332
Share-based compensation expense | 19,375 | 27,669 | 24,754
Deferred income taxes | 8,238 | 6,625 | (4,345)
Non-cash interest expense associated with forward starting swaps | 6,021 | 6,327 | 6,475
Changes in (net of the effect from acquisitions): |  |  |
Receivables | 20,873 | 22,338 | (23,419)
Inventories | 36,523 | (3,322) | (23,031)
Other current assets | (10,276) | (2,361) | 25,162
Trade accounts payable | 2,702 | (9,115) | (1,220)
Deferred revenue | 38,967 | 8,680 | (3,247)
Accrued expenses | (15,326) | (46,664) | 7,125
Other - net | (3,032) | 3,822 | (19,304)
Net cash flows provided by operating activities | 569,273 | 528,062 | 479,345
Cash flows from investing activities |  |  |
Purchases of property, plant and equipment | (51,545) | (50,912) | (56,089)
Purchase of intellectual property | 0 | 0 | (4,000)
Acquisition of businesses, net of cash acquired | (123,133) | (87,180) | (20,205)
Proceeds from disposal of fixed assets | 2,287 | 962 | 363
Contributions received from joint venture partner | 120 | 0 | 0
Other - net | (306) | 115 | (1,500)
Net cash flows used in investing activities | (172,577) | (137,015) | (81,431)
Cash flows from financing activities |  |  |
Borrowings under revolving credit facilities | 150,000 | 0 |
Proceeds from issuance of 3.0% Senior Notes | 499,100 | 0 | 0
Payment of 4.5% Senior Notes | (300,000) | 0 | 0
Payments under revolving credit facilities | (150,000) | 0 | (11,284)
Payments under other long-term borrowings | (396) | (50,057) | 0
Payment of make-whole redemption premium | (6,756) | 0 | 0
Debt issuance costs | (4,749) | 0 | 0
Dividends paid | (151,838) | (147,208) | (127,478)
Proceeds from stock option exercises | 44,587 | 38,809 | 27,639
Repurchases of common stock | (110,342) | (54,668) | (173,926)
Shares surrendered for tax withholding | (12,208) | (12,596) | (11,555)
Settlement of foreign exchange contracts | 0 | 0 | 6,593
Other - net | 0 | (1,865) | 0
Net cash flows used in financing activities | (42,602) | (227,585) | (290,011)
Effect of exchange rate changes on cash and cash equivalents | 39,176 | 2,712 | (17,446)
Net increase in cash | 393,270 | 166,174 | 90,457
Cash and cash equivalents at beginning of year | 632,581 | 466,407 | 375,950
Cash and cash equivalents at end of year | 1,025,851 | 632,581 | 466,407
Cash paid for: |  |  |
Interest | 35,152 | 36,683 | 36,327
Income taxes - net | 87,193 | 109,032 | 90,733
Significant non-cash activities: |  |  |
Contingent consideration for acquisition | 0 | 0 | 3,375
Debt acquired with acquisition of business | 0 | 51,130 | 0
Capital expenditures for construction of new leased facility | $ 0 | $ 0 | $ 11,616

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