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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net Income | $ 41,281 | $ 44,669 | $ 29,923
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 19,001 | 18,294 | 17,345
Provision for doubtful accounts | (237) | 648 | 443
Provision for warranty and returns | 220 | 0 | 0
Stock compensation | 5,563 | 4,016 | 3,471
Loss (gain) on disposal of property and equipment | 212 | (42) | 338
Gain on sale of assets | 0 | (14,242) | 0
Bond premium amortization | 2,585 | 1,294 | 1,092
Cash provided (used) by changes in operating assets and liabilities |  |  |
Accounts receivable | (5,395) | 6,232 | (6,378)
Inventories | 4,573 | 3,170 | (3,670)
Prepaid expenses and other assets | (415) | (920) | (2,518)
Accounts payable | (1,536) | 2,673 | (8,222)
Accrued liabilities | 1,199 | 1,684 | 1,946
Deferred revenue | 0 | (254) | (2,135)
Income taxes, including excess tax benefits and deferred income taxes | (780) | (2,735) | 1,460
Net cash provided by operating activities | 66,271 | 64,487 | 33,095
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (19,160) | (15,824) | (23,171)
Proceeds from Sale of Assets | 10 | 16,201 | 893
Proceeds from insurance | 0 | 2,781 | 622
Intangible asset additions | (1,145) | 0 | 0
Purchases of investment securities | (98,876) | (90,502) | (23,382)
Proceeds from sale of investment securities | 77,798 | 41,610 | 64,670
Net cash provided (used) by investing activities | (41,373) | (45,734) | 19,632
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from exercise of stock options | 14,844 | 7,974 | 2,517
Proceeds from employee stock purchase plan | 2,220 | 1,828 | 1,576
Tax benefits from exercise of stock options | 4,567 | 4,288 | 1,680
Purchase of treasury stock | 0 | (11,956) | (28,648)
Net cash provided (used) by financing activities | 21,631 | 2,134 | (22,875)
Effect of exchange rate changes on cash | 781 | (147) | (2,250)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 47,310 | 20,740 | 27,602
CASH AND CASH EQUIVALENTS, beginning of period | 99,590 | 78,850 | 51,248
CASH AND CASH EQUIVALENTS, end of period | 146,900 | 99,590 | 78,850
SUPPLEMENTAL DISCLSOURE OF CASH FLOW INFORMATION |  |  |
Cash paid during the year for income taxes | 16,741 | 20,110 | 15,249
NON-CASH INVESTING ACTIVITIES |  |  |
Accrued liabilities for property and equipment | $ 427 | $ 418 | $ 716

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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: 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=6943989&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 22 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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