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Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating Activities |  |  |
Net income | $ 70,629 | $ 40,015 | $ 28,255
Adjustments to reconcile net income to cash provided by operating activities: |  |  |
Depreciation and amortization | 14,888 | 12,148 | 9,207
Stock-based compensation | 4,718 | 2,953 | 2,589
Excess and obsolescence inventory reserve | 761 | (234) | (1,057)
Loss (gain) on sale of assets | (944) | (26) | 22
Deferred income taxes | (1,480) | 8,205 | 493
Impairment charge | (1,134) |  |
Changes in operating assets and liabilities: |  |  |
Trade receivables | (793) | (10,660) | (6,516)
Inventories | (6,553) | (156) | 888
Trade accounts payable and accrued expenses | 9,908 | 11,807 | 3,932
Employee compensation and benefits | (4,345) | 3,959 | (1,967)
Product liability | (689) | 724 | (1,060)
Prepaid expenses, other assets and other liabilities | 1,947 | (10,961) | (1,333)
Income taxes payable | 272 | (365) | (962)
Cash provided by operating activities | 87,185 | 57,409 | 32,491
Investing Activities |  |  |
Property, plant and equipment additions | (27,282) | (22,135) | (19,409)
Purchases of short-term investments | (59,966) | (122,978) | (164,966)
Proceeds from sales or maturities of short-term investments | 59,966 | 175,471 | 163,214
Proceeds from sale of assets | 1,003 | 319 | 21
Cash (used for) provided by investing activities | (26,279) | 30,677 | (21,140)
Financing Activities |  |  |
Dividends paid | (111,523) | (8,159) | (6,317)
Tax benefit from exercise of stock options | 3,474 | 3,855 | 1,923
Repurchase of common stock |  | (1,999) | (5,718)
Payment of employee withholding tax related to share-based compensation | (3,083) | (5,859) | (1,115)
Proceeds from exercise of stock options | 148 |  |
Cash used for financing activities | (110,984) | (12,162) | (11,227)
(Decrease) increase in cash and cash equivalents | (50,078) | 75,924 | 124
Cash and cash equivalents at beginning of period | 81,056 | 5,132 | 5,008
Cash and cash equivalents at end of period | $ 30,978 | $ 81,056 | $ 5,132

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