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Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating Activities |  |  |
Net income | $ 111,272 | $ 70,629 | $ 40,015
Adjustments to reconcile net income to cash provided by operating activities: |  |  |
Depreciation and amortization | 20,362 | 14,888 | 12,148
Stock-based compensation | 5,288 | 4,718 | 2,953
Excess and obsolescence inventory reserve | 693 | 761 | (234)
Loss (gain) on sale of assets | 1 | (944) | (26)
Deferred income taxes | 5,736 | (1,480) | 8,205
Impairment of assets | 911 | 1,134 |
Changes in operating assets and liabilities: |  |  |
Trade receivables | (24,366) | (793) | (10,660)
Inventories | (7,945) | (6,553) | (156)
Trade accounts payable and accrued expenses | 9,231 | 9,908 | 11,807
Employee compensation and benefits | 17,897 | (4,345) | 3,959
Product liability | 179 | (689) | 724
Prepaid expenses, other assets and other liabilities | (19,340) | (321) | (10,961)
Income taxes payable | (250) | 272 | (365)
Cash provided by operating activities | 119,669 | 87,185 | 57,409
Investing Activities |  |  |
Property, plant, and equipment additions | (54,616) | (27,282) | (22,135)
Purchases of short-term investments |  | (59,966) | (122,978)
Proceeds from sales or maturities of short- term investments |  | 59,966 | 175,471
Net proceeds from sale of assets | 233 | 1,003 | 319
Cash (used for) provided by investing activities | (54,383) | (26,279) | 30,677
Financing Activities |  |  |
Dividends paid | (41,079) | (111,523) | (8,159)
Tax benefit from exercise of stock options | 2,302 | 3,474 | 3,855
Repurchase of common stock |  |  | (1,999)
Payment of employee withholding tax related to share-based compensation | (2,423) | (3,083) | (5,859)
Proceeds from exercise of stock options |  | 148 |
Cash used for financing activities | (41,200) | (110,984) | (12,162)
Increase (decrease) in cash and cash equivalents | 24,086 | (50,078) | 75,924
Cash and cash equivalents at beginning of year | 30,978 | 81,056 | 5,132
Cash and cash equivalents at end of year | $ 55,064 | $ 30,978 | $ 81,056

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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 -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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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Period Type: | duration

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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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- 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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