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Consolidated Statements Of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Cash flows from operating activities: |  |
Net income | $ 23,737 | $ 35,415
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 21,160 | 21,778
Amortization | 6,740 | 2,702
Deferred income taxes | 2,649 | 5,000
Gain on the sale of property, plant and equipment | (136) | (15)
Asset impairments | 121 | 84
Stock-based compensation expense | 3,981 | 4,020
Excess tax benefit from stock-based compensation | (122) | (340)
Changes in operating assets and liabilities, net of effects from business acquisition: |  |
Accounts receivable | 57,044 | 18,606
Inventories | 37,034 | (44,446)
Prepaid expenses and other assets | (5,864) | (10,205)
Accounts payable | 23,084 | 3,441
Accrued liabilities | (10,572) | 4,895
Income taxes | (1,258) | 178
Net cash provided by operations | 157,598 | 41,113
Cash flows from investing activities: |  |
Proceeds from sales of investments at par | 200 | 50
Additions to property, plant and equipment | (15,149) | (24,308)
Proceeds from the sale of property, plant and equipment | 188 | 420
Additions to purchased software | (1,054) | (698)
Other | (83) | 19
Net cash used in investing activities | (15,898) | (24,517)
Cash flows from financing activities: |  |
Proceeds from stock options exercised | 823 | 1,471
Excess tax benefits from stock-based compensation | 122 | 340
Principal payments on long-term debt and capital lease obligations | (6,149) | (327)
Share repurchases | (29,315) | (34,558)
Net cash used in financing activities | (34,519) | (33,074)
Effect of exchange rate changes | 72 | (1,583)
Net increase (decrease) in cash and cash equivalents | 107,253 | (18,061)
Cash and cash equivalents at beginning of year | 465,995 | 427,376
Cash and cash equivalents at end of period | $ 573,248 | $ 409,315

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. 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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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 3: 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 security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + 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),(b) -URI http://asc.fasb.org/extlink&oid=56944662&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 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=56944662&loc=d3e3602-108585 + Details
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