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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 | $ 140,386 | $ 392,896 | $ 339,132
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 110,034 | 79,853 | 82,556
Amortization of inventory step-up adjustment to fair value | 7,624 |  |
Amortization of debt issuance cost and original issue discount | 7,074 | 4,718 | 10,699
Stock-based compensation | 49,194 | 27,262 | 24,378
Provision for excess and obsolete inventory | 24,734 | 22,324 | 20,213
Provision for doubtful accounts | (728) | 1,435 | 825
Deferred income taxes | (4,215) | (19,388) | (4,831)
Gain on sale of long-lived asset | (6,773) |  |
Gain on sale of business |  |  | (74,856)
Asset impairment | 4,662 |  | 6,719
Other | 870 | 2,649 | 824
Changes in operating assets and liabilities, net of business acquired: |  |  |
Trade accounts receivable | (93) | (546) | (44,077)
Inventories | (29,289) | (73,779) | (72,471)
Income taxes payable | (12,374) | (11,430) | 12,805
Other current and non-current assets | (9,830) | (1,639) | (8,631)
Current and non-current accrued compensation | (4,191) | (8,649) | 32,502
Other current and non-current liabilities | (8,424) | (3,948) | 18,030
Accounts payable | (24,152) | 2,023 | 11,405
Net cash provided by operating activities | 244,509 | 413,781 | 355,222
Cash flows (used in) provided by investing activities: |  |  |
Acquisition of business, net of cash acquired | (988,599) |  |
Net proceeds from sale of business |  |  | 72,509
Purchases of investments | (246,315) | (253,598) | (229,557)
Maturities of investments | 142,571 | 181,749 | 157,342
Sales of investments | 166,915 | 207,542 | 53,564
Proceeds from sale of assets | 42,079 |  |
Purchases of property, plant and equipment | (63,904) | (62,941) | (31,287)
Other |  |  | 66
Net cash (used in) provided by investing activities | (947,253) | 72,752 | 22,637
Cash flows provided by (used in) financing activities: |  |  |
Net proceeds from short and long-term borrowings | 642,207 | 67,669 | 28,551
Payments of short-term borrowings | (5,375) | (67,163) | (29,711)
Payments of long-term borrowings | (106,116) | (50,003) | (228,141)
Repurchases of common stock |  | (75,000) |
Dividend payments | (43,528) | (42,405) | (38,178)
Net payments related to employee stock awards | (11,010) | (11,104) | (12,216)
Net cash provided by (used in) financing activities | 476,178 | (178,006) | (279,695)
Effect of exchange rate changes on cash and cash equivalents | (3,207) | 1,931 | 1,813
(Decrease) increase in cash and cash equivalents | (229,773) | 310,458 | 99,977
Cash and cash equivalents at beginning of period | 644,345 | 333,887 | 233,910
Cash and cash equivalents at end of period | 414,572 | 644,345 | 333,887
Cash paid during the period for: |  |  |
Interest | 39,899 | 14,593 | 20,467
Income Taxes Paid | $ 35,512 | $ 91,765 | $ 104,691

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- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585 Reference 3: 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 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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