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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |  |
Net income (loss) | $ 37,027 | $ (10,937) | $ 8,779
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Amortization of intangibles | 27,329 | 29,204 | 30,420
Depreciation | 16,641 | 15,195 | 13,867
Stock-based compensation | 16,089 | 18,926 | 20,913
Gain on sale of discontinued operations, net of tax | (14,663) | 0 | 0
Loss on impairment of fixed assets | 149 | 0 | 0
Net (gain) loss on disposal of fixed assets | 95 | (36) | 671
Deferred income taxes | (8,537) | (4,969) | (361)
Provision for doubtful accounts and sales returns | 960 | 3,602 | 3,235
Provision for excess and obsolete inventories | 3,475 | 3,377 | 3,936
Excess tax benefits from stock-based compensation | (141) | (121) | (1,955)
Other non-cash adjustments, net | 2,098 | 1,006 | 801
Changes in assets and liabilities: |  |  |
Accounts receivable | 9,908 | 20,368 | (11,477)
Inventories | 13,290 | 3,003 | (16,588)
Prepaid expenses and other assets | 1,807 | (2,684) | 7,924
Accounts payable | (3,363) | (5,201) | 4,750
Deferred revenues | (1,922) | 1,334 | (13,470)
Income taxes payable | (40,546) | 1,535 | (6,843)
Accrued and other liabilities | (5,937) | (2,789) | 575
Net cash provided by operating activities | 53,759 | 70,813 | 45,177
Cash flows from investing activities: |  |  |
Purchases of investments | (78,764) | (133,778) | (107,544)
Proceeds from maturities of investments | 63,034 | 57,484 | 28,733
Proceeds from sales of investments | 37,890 | 41,354 | 30,999
Purchases of property and equipment | (14,581) | (12,609) | (17,269)
Proceeds from sale of discontinued operations, net of selling costs | 43,515 | 0 | 0
Other acquisitions | 0 | 0 | (250)
Net cash provided by (used in) investing activities | 51,094 | (47,549) | (65,331)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock, net | 5,186 | 4,819 | 12,701
Payments for repurchase of common stock | (116,529) | (22,639) | 0
Excess tax benefits from stock-based compensation | 141 | 121 | 1,955
Net cash (used in) provided by financing activities | (111,202) | (17,699) | 14,656
Effect of exchange rate changes on cash and cash equivalents | 8 | 122 | (52)
Net increase (decrease) in cash and cash equivalents | (6,341) | 5,687 | (5,550)
Cash and cash equivalents at beginning of period | 96,670 | 90,983 | 96,533
Cash and cash equivalents at end of period | 90,329 | 96,670 | 90,983
Supplemental disclosures of cash flow information: |  |  |
Income tax payments, net | 4,341 | 5,051 | 7,597
Supplemental schedule of non-cash investing activity: |  |  |
Net increase in accrued purchases of property and equipment | $ 321 | $ 113 | $ 0

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