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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 | $ 193,468 | $ 69,984 | $ 27,609
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 19,190 | 18,918 | 18,374
Amortization of intangibles | 5,213 | 5,267 | 6,083
Loss on disposal of property and equipment | 249 | 553 | 360
Stock-based compensation expense | 23,347 | 21,580 | 24,677
Amortization of premium (accretion of discount) on marketable securities | (192) | 227 | 1,100
Deferred income taxes | 4,019 | (4,465) | 15,838
Increase (decrease) in accounts receivable allowances | 57 | (28) | 209
Change in operating assets and liabilities: |  |  |
Accounts receivable | (13,259) | 5,754 | (10,479)
Inventories | (9,523) | (23,770) | (4,523)
Prepaid expenses and other assets | (2,132) | (1,495) | (17,646)
Accounts payable | (6,556) | 1,336 | 396
Taxes payable and accrued liabilities | 10,618 | (9,897) | 20,041
Net cash provided by operating activities | 224,499 | 83,964 | 82,039
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (24,114) | (24,677) | (32,496)
Acquisition of technology licenses | (1,026) | (900) | 0
Purchases of marketable securities | (207,240) | (62,833) | (151,663)
Proceeds from sales and maturities of marketable securities | 70,334 | 157,551 | 149,443
Net cash provided by (used in) investing activities | (162,046) | 69,141 | (34,716)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Issuance of common stock under employee stock plans | 9,908 | 9,353 | 10,020
Repurchase of common stock | (7,302) | (103,153) | (9,188)
Payments of dividends to stockholders | (20,506) | (18,823) | (16,634)
Proceeds from draw on line of credit | 0 | 8,000 | 5,000
Payments on line of credit | 0 | (8,000) | (5,000)
Net cash used in financing activities | (17,900) | (112,623) | (15,802)
NET INCREASE IN CASH AND CASH EQUIVALENTS | 44,553 | 40,482 | 31,521
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 134,137 | 93,655 | 62,134
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 178,690 | 134,137 | 93,655
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |  |
Unpaid property and equipment | 4,355 | 1,818 | 4,913
Unpaid technology licenses | 0 | 100 | 0
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Cash paid (refund) for income taxes, net of refunds (Note 11) | $ 21,327 | $ 7,437 | $ (1,571)

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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 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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