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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |
Net income | $ 53,711 | $ 42,329 | $ 53,830
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 22,766 | 17,655 | 15,007
Amortization of bond premiums | 0 | 13 | 47
Amortization of debt issuance costs | 7 | 0 | 0
Provision for losses on accounts receivable, net of adjustments | 91 | 174 | 179
Provision for excess and obsolete inventories | 1,454 | 152 | 264
Share-based compensation | 11,799 | 7,862 | 6,313
Loss (gain) on disposition of assets | 337 | (12) | 45
Foreign currency transaction (gain) loss | (27) | 55 | (59)
Interest income on note receivable | (25) | (27) | (25)
Deferred income taxes | 6,038 | 2,641 | (749)
Changes in assets and liabilities: |  |  |
Accounts receivable | (13,412) | (2,832) | (7,516)
Income tax receivable | 5,129 | (4,448) | 4,591
Inventories | 2,557 | (5,598) | (23,698)
Prepaid expenses and other | (329) | (528) | 98
Accounts payable | 280 | (1,176) | 3,043
Deferred revenue | 425 | 412 | 258
Accrued liabilities and donations | 7,124 | (1,816) | 6,366
Net cash provided by operating activities | 97,925 | 54,856 | 57,994
Investing Activities |  |  |
Capital expenditures | (37,166) | (37,268) | (41,713)
Cash paid in business combination | 0 | (6,377) | 0
Proceeds from sale of property, plant and equipment | 69 | 13 | 10
Investment in certificates of deposits | (6,000) | (7,200) | (5,280)
Maturities of certificates of deposits | 6,000 | 10,080 | 7,912
Purchase of investments held to maturity | 0 | (9,001) | (13,241)
Maturities of investments held to maturity | 0 | 14,570 | 19,700
Proceeds from called investments | 0 | 495 | 1,500
Principal payments from note receivable | 51 | 53 | 60
Net cash used in investing activities | (37,046) | (34,635) | (31,052)
Financing Activities |  |  |
Proceeds from financing obligation, net of issuance costs | 6,614 | 0 | 0
Payment related to financing costs | (301) | 0 | 0
Stock options exercised | 12,625 | 4,987 | 2,259
Repurchase of stock | (19,586) | (26,846) | (16,620)
Employee taxes paid by withholding shares | (1,207) | (1,097) | (1,614)
Cash dividends paid to stockholders | (16,645) | (16,728) | (13,663)
Net cash used in financing activities | (18,500) | (39,684) | (29,638)
Net increase (decrease) in cash, cash equivalents and restricted cash | 42,379 | (19,463) | (2,696)
Cash, cash equivalents and restricted cash, beginning of year | 1,994 | 21,457 | 24,153
Cash, cash equivalents and restricted cash, end of year | $ 44,373 | $ 1,994 | $ 21,457

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- Definition Amount of cash outflow to acquire investments classified as other. + 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 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible 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=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + 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 (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition Amount of cash inflow from 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://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 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://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 + Details
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- Definition The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity. + 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 (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 Reference 2: 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 associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy. + 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 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + 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 cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + 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 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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