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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 47,248 | $ 44,507
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 14,369 | 13,323
Amortization of intangibles | 3,967 | 4,631
Loss on disposal of property and equipment | 455 | 324
Stock-based compensation expense | 16,138 | 17,822
Amortization of premium on marketable securities | 342 | 803
Deferred income taxes | (1,395) | (485)
Increase in accounts receivable allowances | 170 | 209
Change in operating assets and liabilities: |  |
Accounts receivable | 2,886 | (10,873)
Inventories | (17,114) | (2,594)
Prepaid expenses and other assets | (2,721) | (21,048)
Accounts payable | 2,647 | 5,299
Taxes payable and accrued liabilities | (1,357) | 2,679
Net cash provided by operating activities | 65,635 | 54,597
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of property and equipment | (19,120) | (29,567)
Acquisition of technology licenses | (900) | 0
Purchases of marketable securities | (58,221) | (146,073)
Proceeds from sales and maturities of marketable securities | 147,501 | 120,695
Net cash provided by (used in) investing activities | 69,260 | (54,945)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Issuance of common stock under employee stock plans | 8,550 | 8,111
Repurchase of common stock | (74,377) | (6,734)
Payments of dividends to stockholders | (14,172) | (12,463)
Proceeds from draw on line of credit | 8,000 | 5,000
Payments on line of credit | (8,000) | (5,000)
Net cash used in financing activities | (79,999) | (11,086)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 54,896 | (11,434)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 93,655 | 62,134
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 148,551 | 50,700
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |
Unpaid property and equipment | 3,424 | 5,273
Unpaid technology licenses | 100 | 0
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |
Cash paid (refund) for income taxes, net | $ 5,897 | $ (1,593)

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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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