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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities: |  |  |
Net income | $ 149,572 | $ 187,074 | $ 121,485
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
(Gain) loss on sale of discontinued business | 255 | (78,182) | 0
Stock-based compensation expense | 20,558 | 20,168 | 15,158
Depreciation of property, plant, and equipment | 11,678 | 9,868 | 8,443
Amortization of intangible assets | 3,391 | 4,250 | 4,024
Amortization of discounts or premiums on investments | 383 | 690 | 1,823
Realized (gain) loss on sale of investments | (1,506) | (344) | (673)
Revaluation of contingent consideration | (463) | (790) | 0
Change in deferred income taxes | (1,908) | (1,409) | (2,364)
Accounts receivable | (13,251) | (3,950) | (915)
Unbilled revenue | (2,308) | (242) | (563)
Inventories | 10,409 | (9,457) | (11,750)
Accounts payable | 2,087 | (8,872) | 10,896
Accrued expenses | 7,771 | (2,831) | 7,812
Accrued income taxes | 2,110 | 9,957 | 7,700
Deferred revenue and customer deposits | (3,188) | 1,527 | 5,893
Other | (3,509) | 870 | (3,128)
Net cash provided by operating activities | 182,081 | 128,327 | 163,841
Cash flows from investing activities: |  |  |
Purchases of investments | (751,868) | (686,650) | (422,633)
Maturities and sales of investments | 657,250 | 601,441 | 339,470
Purchases of property, plant, and equipment | (12,816) | (18,228) | (20,934)
Cash paid for acquisition of business, net of cash acquired | (14,285) | (1,023) | 0
Cash paid for purchased technology | 0 | (10,475) | 0
Net cash received (paid) from sale of discontinued business | (113) | 104,388 | 0
Net cash used in investing activities | (121,832) | (10,547) | (104,097)
Cash flows from financing activities: |  |  |
Issuance of common stock under stock plans | 43,468 | 27,582 | 16,930
Repurchase of common stock | (47,149) | (126,351) | (59,673)
Payment of dividends | (25,213) | (18,062) | 0
Payment of contingent consideration | (337) | 0 | 0
Net cash used in financing activities | (29,231) | (116,831) | (42,743)
Effect of foreign exchange rate changes on cash and cash equivalents | (3,352) | (4,668) | (1,951)
Net change in cash and cash equivalents | 27,666 | (3,719) | 15,050
Cash and cash equivalents at beginning of year | 51,975 | 55,694 | 40,644
Cash and cash equivalents at end of year | 79,641 | 51,975 | 55,694
Stock-based compensation expense | 0 | 1,533 | 1,099
Depreciation and amortization expense | 0 | 566 | 1,141
Capital expenditures | $ 0 | $ 482 | $ 631

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + 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 (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 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 outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66902209&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 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=66902209&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=66902209&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=66902209&loc=d3e3213-108585 + 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=66902209&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=66902209&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=66902209&loc=d3e3602-108585 + Details
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