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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income | $ 392,896 | $ 339,132 | $ 104,809
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 79,853 | 82,556 | 65,926
Amortization of inventory step-up adjustment to fair value |  |  | 15,090
Amortization of debt issuance cost and original issue discount | 4,718 | 10,699 | 9,265
Stock-based compensation | 27,262 | 24,378 | 25,228
Provision for excess and obsolete inventory | 22,324 | 20,213 | 16,039
Provision for doubtful accounts | 1,435 | 825 | 1,109
Deferred income taxes | (19,388) | (4,831) | (38,822)
Excess tax benefits from stock-based compensation |  |  | (1,468)
Asset impairment |  | 6,719 | 5,000
Gain on sale of business |  | (74,856) |
Other | 2,649 | 824 | 256
Changes in operating assets and liabilities: |  |  |
Trade accounts receivable | (546) | (44,077) | (58,111)
Inventories | (73,779) | (72,471) | (13,798)
Income taxes | (11,430) | 12,805 | 30,914
Other current and non-current assets | (1,639) | (8,631) | (12,165)
Accrued compensation | (8,649) | 32,502 | 10,965
Other current and non-current liabilities | (3,948) | 18,030 | 3,681
Accounts payable | 2,023 | 11,405 | 16,180
Net cash provided by operating activities | 413,781 | 355,222 | 180,098
Cash flows from investing activities: |  |  |
Acquisition of business, net of cash acquired |  |  | (939,591)
Net proceeds from sale of business |  | 72,509 |
Purchases of investments | (253,598) | (229,557) | (268,458)
Maturities of investments | 181,749 | 157,342 | 160,917
Sales of investments | 207,542 | 53,564 | 338,996
Purchases of property, plant and equipment | (62,941) | (31,287) | (19,123)
Other |  | 66 | 273
Net cash provided by (used in) investing activities | 72,752 | 22,637 | (726,986)
Cash flows from financing activities: |  |  |
Proceeds from short-term borrowings | 67,629 | 28,360 | 18,964
Payments of short-term borrowings | (67,163) | (29,711) | (11,742)
Proceeds from long-term borrowings | 40 | 191 | 744,653
Payments of long-term borrowings | (50,003) | (228,141) | (153,395)
Repurchases of common stock | (75,000) |  | (1,545)
Net proceeds related to employee stock awards | (11,104) | (12,216) | (1,922)
Dividend payments | (42,405) | (38,178) | (36,361)
Excess tax benefit from stock-based compensation |  |  | 1,468
Net cash (used in) provided by financing activities | (178,006) | (279,695) | 560,120
Effect of exchange rate changes on cash and cash equivalents | 1,931 | 1,813 | (6,896)
Increase in cash and cash equivalents | 310,458 | 99,977 | 6,336
Cash and cash equivalents, including restricted cash, at beginning of year | 333,887 | 233,910 | 227,574
Cash and cash equivalents, including restricted cash, at end of year | 644,345 | 333,887 | 233,910
Cash paid during the period for: |  |  |
Interest | 14,593 | 20,467 | 20,839
Income taxes | $ 91,765 | $ 104,691 | $ 44,967

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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=109223946&loc=d3e3291-108585 + Details
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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=109223946&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=109223946&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=109979856&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=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + 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 (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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