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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |  |
Net income | $ 187,074 | $ 121,485 | $ 73,573
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Net gain on sale of discontinued business | (78,182) | 0 | 0
Stock-based compensation expense | 20,168 | 15,158 | 10,620
Depreciation of property, plant, and equipment | 9,868 | 8,443 | 7,305
Amortization of intangible assets | 4,250 | 4,024 | 3,797
Amortization of discounts or premiums on investments | 690 | 1,823 | 2,519
Realized (gain) loss on sale of investments | (344) | (673) | 403
Revaluation of contingent consideration | (790) | 0 | 0
Tax effect of stock option exercises | (9,964) | (7,871) | (7,658)
Change in deferred income taxes | (1,409) | (2,364) | 2,234
Accounts receivable | (3,950) | (915) | (11,311)
Inventories | (9,457) | (11,750) | 666
Accounts payable | (8,872) | 10,896 | 2,644
Accrued expenses | (2,831) | 7,812 | 5,593
Accrued income taxes | 9,957 | 7,700 | 7,968
Other | 2,155 | 2,202 | (2,898)
Net cash provided by operating activities | 118,363 | 155,970 | 95,455
Cash flows from investing activities: |  |  |
Purchases of investments | (686,650) | (422,633) | (370,781)
Maturities and sales of investments | 601,441 | 339,470 | 296,091
Purchases of property, plant, and equipment | (18,228) | (20,934) | (9,630)
Cash paid for acquisition of business | (1,023) | 0 | 0
Cash paid for purchased technology | (10,475) | 0 | (3,750)
Net proceeds from sale of discontinued business | 104,388 | 0 | 0
Net cash used in investing activities | (10,547) | (104,097) | (88,070)
Cash flows from financing activities: |  |  |
Issuance of common stock under stock plans | 27,582 | 16,930 | 27,792
Repurchase of common stock | (126,351) | (59,673) | (47,908)
Payment of dividends | (18,062) | 0 | 0
Tax effect of stock option exercises | 9,964 | 7,871 | 7,658
Net cash used in financing activities | (106,867) | (34,872) | (12,458)
Effect of foreign exchange rate changes on cash and cash equivalents | (4,668) | (1,951) | 557
Net change in cash and cash equivalents | (3,719) | 15,050 | (4,516)
Cash and cash equivalents at beginning of year | 55,694 | 40,644 | 45,160
Cash and cash equivalents at end of year | 51,975 | 55,694 | 40,644
Stock-based compensation expense | 1,533 | 1,099 | 837
Depreciation and amortization expense | 566 | 1,141 | 1,079
Capital expenditures | $ 482 | $ 631 | $ 749

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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + 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 (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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