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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Cash flows from operating activities: |  |
Net Income | $ 34,950 | $ 27,657
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 12,034 | 10,260
Amortization of net premium on available-for-sale investments | 352 | 489
Net realized gain on long-term investments | (2,869) | (4,154)
Net (gain) loss on disposal of property, plant and equipment | (10) | 21
Gain on bargain purchase of a business |  | (3,550)
Stock-based compensation expense | 5,573 | 4,601
Deferred income taxes |  | (463)
Changes in operating assets and liabilities: |  |
Accounts receivable, net | (6,975) | (29,370)
Other receivables | (2,924) | 7,475
Inventory | (9,483) | (683)
Prepaid expenses and other assets | (9,647) | (5,180)
Accounts payable | (4,727) | 16,363
Accrued expenses and other liabilities | (2,820) | 7,307
Income tax payable/receivable, net | 8,571 | (2,941)
Net cash provided by operating activities | 22,025 | 27,832
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (12,304) | (12,684)
Proceeds from disposals of property, plant and equipment | 16 |
Proceeds from sales and maturities of available-for-sale investments | 137,272 | 141,103
Purchases of available-for-sale investments | (79,713) | (139,181)
Acquisition of business |  | (943)
Net cash provided by (used in) investing activities | 45,271 | (11,705)
Cash flows from financing activities: |  |
Proceeds from stock option exercises | 6,606 | 1,076
Purchases of treasury stock | (17,348) | (22,917)
Dividend payments | (13,031) | (13,230)
Net cash used in financing activities | (23,773) | (35,071)
Net increase (decrease) in cash and cash equivalents | 43,523 | (18,944)
Effect of exchange rate changes | 4,835 | 686
Cash and cash equivalents, beginning of period | 79,895 | 84,550
Cash and cash equivalents, end of period | 128,253 | 66,292
Supplemental disclosure of non-cash investing activities: |  |
Purchases of property, plant and equipment included in accounts payable | $ 272 | $ 1,174

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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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + 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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