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Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Cash flows from operating activities: |  |
Net income | $ 43,670 | $ 38,492
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 29,635 | 26,459
Deferred income taxes | 9,001 | 7,876
Gain on the sale of property, plant and equipment | (1,260) | (204)
Asset impairments | 4,825 | 0
Stock-based compensation expense | 5,310 | 4,723
Excess tax benefit from stock-based compensation | (285) | (25)
Changes in operating assets and liabilities, net of effects from business acquisition: |  |
Accounts receivable | 47,137 | (30,795)
Inventories | (56,453) | 14,325
Prepaid expenses and other assets | 4,778 | 29,373
Accounts payable | 24,507 | (15,327)
Accrued liabilities | (8,701) | (1,258)
Income taxes | (2,233) | (3,373)
Net cash provided by operations | 99,931 | 70,266
Cash flows from investing activities: |  |
Proceeds from sales and redemptions of investments | 25 | 11,025
Additions to property, plant and equipment | (18,268) | (34,458)
Proceeds from the sale of property, plant and equipment | 1,796 | 228
Additions to purchased software | (1,879) | (1,050)
Business acquisition, net of cash acquired | (19,270) | 0
Thailand flood property insurance proceeds | 0 | 22,351
Net cash used in investing activities | (37,596) | (1,904)
Cash flows from financing activities: |  |
Proceeds from stock options exercised | 10,405 | 3,461
Excess tax benefits from stock-based compensation | 285 | 25
Principal payments on capital lease obligations | (368) | (310)
Share repurchases | (30,673) | (31,387)
Debt issuance costs | 0 | (867)
Net cash used in financing activities | (20,351) | (29,078)
Effect of exchange rate changes | (3) | 2,574
Net increase in cash and cash equivalents | 41,981 | 41,858
Cash and cash equivalents at beginning of year | 384,579 | 283,920
Cash and cash equivalents at end of year | $ 426,560 | $ 325,778

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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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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 3: 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=31042434&loc=d3e3255-108585 + Details
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Balance Type: | debit
Period Type: | duration

X
- 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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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=31042434&loc=d3e3291-108585 + Details
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Balance Type: | credit
Period Type: | duration

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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=31042434&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration