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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 | $ 71,176 | $ 193,468 | $ 69,984
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 23,743 | 19,190 | 18,918
Amortization of intangibles | 4,359 | 5,213 | 5,267
Loss on disposal of property and equipment | 525 | 249 | 553
Stock-based compensation expense | 30,912 | 23,347 | 21,580
Amortization of premium (accretion of discount) on marketable securities | 705 | (192) | 227
Deferred income taxes | (592) | 4,019 | (4,465)
Increase (decrease) in accounts receivable allowance for credit losses, net | (336) | 57 | (28)
Change in operating assets and liabilities: |  |  |
Accounts receivable | (11,300) | (13,259) | 5,754
Inventories | (12,498) | (9,523) | (23,770)
Prepaid expenses and other assets | 9,153 | (2,132) | (1,495)
Accounts payable | 5,697 | (6,556) | 1,336
Taxes payable and accrued liabilities | 4,095 | 10,618 | (9,897)
Net cash provided by operating activities | 125,639 | 224,499 | 83,964
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (70,598) | (24,114) | (24,677)
Proceeds from sale of property and equipment | 651 | 0 | 0
Acquisition of technology licenses | 0 | (1,026) | (900)
Purchases of marketable securities | (109,703) | (207,240) | (62,833)
Proceeds from sales and maturities of marketable securities | 151,385 | 70,334 | 157,551
Net cash provided by (used in) investing activities | (28,265) | (162,046) | 69,141
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Issuance of common stock under employee stock plans | 10,527 | 9,908 | 9,353
Repurchase of common stock | (2,636) | (7,302) | (103,153)
Payments of dividends to stockholders | (25,081) | (20,506) | (18,823)
Proceeds from draw on line of credit | 0 | 0 | 8,000
Payments on line of credit | 0 | 0 | (8,000)
Net cash used in financing activities | (17,190) | (17,900) | (112,623)
NET INCREASE IN CASH AND CASH EQUIVALENTS | 80,184 | 44,553 | 40,482
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 178,690 | 134,137 | 93,655
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 258,874 | 178,690 | 134,137
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |  |
Unpaid property and equipment | 5,937 | 4,355 | 1,818
Unpaid technology licenses | 0 | 0 | 100
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Cash paid (received) for income taxes, net (Note 11) | $ (1,973) | $ 21,327 | $ 7,437

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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of 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://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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 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 inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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