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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Cash Flows [Abstract] |  |  |
Cash and cash equivalents at beginning of year | $ 613,110 | $ 555,320 | $ 1,137,303
Cash flows from operating activities: |  |  |
Net income | 446,615 | 604,357 | 739,139
Adjustments to reconcile net income to cash flows from operating activities: |  |  |
Depreciation and amortization | 231,984 | 213,484 | 200,698
Gain on sale of business or joint venture | (7,168) | 0 | (210,428)
Gain on sale of property | 0 | (14,411) | 0
Stock-based compensation and other | 22,837 | 19,680 | 15,228
Equity in net income of unconsolidated investments (net of tax) | (127,521) | (129,568) | (89,264)
Dividends received from unconsolidated investments and nonmarketable securities | 88,161 | 71,746 | 57,415
Pension and postretirement expense | 45,658 | 31,515 | 10,410
Pension and postretirement contributions | (16,434) | (16,478) | (15,236)
Unrealized gain on investments in marketable securities | (4,635) | (2,809) | (527)
Loss on early extinguishment of debt | 0 | 4,829 | 0
Deferred income taxes | (1,976) | 14,394 | 49,164
Changes in current assets and liabilities, net of effects of acquisitions and divestitures: |  |  |
Decrease (increase) in accounts receivable | 100,118 | (18,220) | (97,448)
Decrease (increase) in inventories | 51,978 | (46,304) | (124,067)
Decrease (increase) in other current assets | 7,902 | (32,941) | (2,181)
(Decrease) increase in accounts payable | (31,519) | (12,234) | 73,730
(Decrease) in accrued expenses and income taxes payable | (215,011) | (4,640) | (1,999)
Other, net | 207,925 | 36,974 | (58,469)
Net cash provided by operating activities | 798,914 | 719,374 | 546,165
Cash flows from investing activities: |  |  |
Acquisitions, net of cash acquired | (22,572) | (820,000) | (11,403)
Capital expenditures | (850,477) | (851,796) | (699,991)
Cash proceeds from divestitures, net | 0 | 0 | 413,569
Proceeds from sale of joint venture | 11,000 | 0 | 0
Proceeds from sale of property and equipment | 0 | 10,356 | 0
Sales of (investments in) marketable securities, net | 903 | 384 | (270)
Investments in equity and other corporate investments | (2,427) | (2,569) | (5,600)
Net cash used in investing activities | (863,573) | (1,663,625) | (303,695)
Cash flows from financing activities: |  |  |
Proceeds from borrowings of other long-term debt | 452,163 | 1,597,807 | 0
Repayments of long-term debt | (250,000) | (175,215) | 0
Other borrowings (repayments), net | 137,635 | (126,364) | (113,567)
Fees related to early extinguishment of debt | 0 | (4,419) | 0
Dividends paid to shareholders | (161,818) | (152,204) | (144,596)
Dividends paid to noncontrolling interests | (32,061) | (83,187) | (14,756)
Repurchases of common stock | 0 | 0 | (500,000)
Proceeds from exercise of stock options | 40,437 | 4,814 | 3,633
Withholding taxes paid on stock-based compensation award distributions | (5,143) | (11,031) | (17,240)
Debt financing costs | (3,952) | (7,514) | 0
Net cash provided by (used in) financing activities | 177,261 | 1,042,687 | (786,526)
Net effect of foreign exchange on cash and cash equivalents | 21,012 | (40,646) | (37,927)
Increase (decrease) in cash and cash equivalents | 133,614 | 57,790 | (581,983)
Cash and cash equivalents at end of year | $ 746,724 | $ 613,110 | $ 555,320

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