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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 | $ 69,984 | $ 27,609 | $ 48,898
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 18,918 | 18,374 | 16,812
Amortization of intangibles | 5,267 | 6,083 | 6,663
Loss on disposal of property and equipment | 553 | 360 | 332
Stock-based compensation expense | 21,580 | 24,677 | 20,885
Amortization of premium on marketable securities | 227 | 1,100 | 555
Deferred income taxes | (4,465) | 15,838 | (638)
Increase (decrease) in accounts receivable allowances | (28) | 209 | 207
Change in operating assets and liabilities: |  |  |
Accounts receivable | 5,754 | (10,479) | 751
Inventories | (23,770) | (4,523) | (630)
Prepaid expenses and other assets | (1,495) | (17,646) | (2,524)
Accounts payable | 1,336 | 396 | 7,714
Taxes payable and accrued liabilities | (9,897) | 20,041 | (1,124)
Net cash provided by operating activities | 83,964 | 82,039 | 97,901
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (24,677) | (32,496) | (12,198)
Acquisition of technology licenses | (900) | 0 | 0
Purchases of marketable securities | (62,833) | (151,663) | (188,654)
Proceeds from sales and maturities of marketable securities | 157,551 | 149,443 | 83,423
Net cash provided by (used in) investing activities | 69,141 | (34,716) | (117,429)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Issuance of common stock under employee stock plans | 9,353 | 10,020 | 13,059
Repurchase of common stock | (103,153) | (9,188) | (6,435)
Payments of dividends to stockholders | (18,823) | (16,634) | (15,054)
Proceeds from draw on line of credit | 8,000 | 5,000 | 0
Payments on line of credit | (8,000) | (5,000) | 0
Net cash used in financing activities | (112,623) | (15,802) | (8,430)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 40,482 | 31,521 | (27,958)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 93,655 | 62,134 | 90,092
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 134,137 | 93,655 | 62,134
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |  |
Unpaid property and equipment | 1,818 | 4,913 | 1,825
Unpaid technology licenses | 100 | 0 | 0
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Cash paid (refund) for income taxes, net of refunds (Note 11) | $ 7,437 | $ (1,571) | $ 6,613

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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=109223946&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=109223946&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=109223946&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=109979856&loc=d3e26853-111562 + 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=109223946&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 The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + 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=109223946&loc=d3e3602-108585 + Details
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