CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ (46,248)us-gaap_NetIncomeLoss	$ 37,027us-gaap_NetIncomeLoss	$ (10,937)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of intangibles	20,520us-gaap_AmortizationOfIntangibleAssets	27,329us-gaap_AmortizationOfIntangibleAssets	29,204us-gaap_AmortizationOfIntangibleAssets
Depreciation	16,459us-gaap_Depreciation	16,641us-gaap_Depreciation	15,195us-gaap_Depreciation
Stock-based compensation	17,287us-gaap_ShareBasedCompensation	16,089us-gaap_ShareBasedCompensation	18,926us-gaap_ShareBasedCompensation
Gain on sale of discontinued operations, net of tax	0	(14,663)	0
Restructuring, asset impairment	1,622	244
(Gain) loss on retirement of fixed assets			(36)
Deferred income taxes, net	32,163	(8,537)	(4,969)
Provision for doubtful accounts and sales returns	1,943us-gaap_ProvisionForDoubtfulAccounts	960us-gaap_ProvisionForDoubtfulAccounts	3,602us-gaap_ProvisionForDoubtfulAccounts
Provision for excess and obsolete inventories	2,569us-gaap_InventoryWriteDown	3,475us-gaap_InventoryWriteDown	3,377us-gaap_InventoryWriteDown
Excess tax benefits from stock-based compensation	(15)	(141)	(121)
Other non-cash adjustments, net	1,108	2,098	1,006
Changes in assets and liabilities:
Accounts receivable	(1,035)	9,908	20,368
Inventories	1,610us-gaap_IncreaseDecreaseInInventories	13,290us-gaap_IncreaseDecreaseInInventories	3,003us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(3,332)	1,807	(2,684)
Accounts payable	56	(3,363)	(5,201)
Deferred revenues	11,162	(1,922)	1,334
Income taxes payable	(7,094)	(40,546)	1,535
Accrued and other liabilities	(1,406)	(5,937)	(2,789)
Net cash provided by operating activities	47,369	53,759	70,813
Cash flows from investing activities:
Purchases of investments	(26,599)us-gaap_PaymentsToAcquireInvestments	(78,764)us-gaap_PaymentsToAcquireInvestments	(133,778)us-gaap_PaymentsToAcquireInvestments
Proceeds from maturities of investments	60,811	63,034	57,484
Proceeds from sales of investments	13,045	37,890	41,354
Purchases of property and equipment	(10,065)	(14,581)	(12,609)
Proceeds from sale of discontinued operations, net of selling costs	0	43,515	0
Purchases of long-term investments	(9,393)	0	0
Net cash provided by (used in) investing activities	27,799	51,094	(47,549)
Cash flows from financing activities:
Proceeds from issuance of common stock, net	1,106	5,186	4,819
Payments for repurchases of common stock	(93,128)	(116,529)	(22,639)
Excess tax benefits from stock-based compensation	15	141	121
Net cash used in financing activities	(92,007)	(111,202)	(17,699)
Effect of exchange rate changes on cash and cash equivalents	(458)	8	122
Net (decrease) increase in cash and cash equivalents	(17,297)	(6,341)	5,687
Cash and cash equivalents at beginning of period	90,329	96,670	90,983
Cash and cash equivalents at end of period	73,032	90,329	96,670
Supplemental disclosures of cash flow information:
Income tax payments, net	1,926us-gaap_IncomeTaxesPaidNet	4,341us-gaap_IncomeTaxesPaidNet	5,051us-gaap_IncomeTaxesPaidNet
Supplemental schedule of non-cash investing activity:
Net increase in accrued purchases of property and equipment	418	321	113
Other Noncash Income (Expense) [Abstract]
Prepaid inventories netted with accounts payable	$ 7,500us-gaap_OtherNoncashExpense	$ 0us-gaap_OtherNoncashExpense	$ 0us-gaap_OtherNoncashExpense

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow from maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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-Paragraph 12

-Subparagraph (a),(b)

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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-Number 210

-Section 03

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-Article 5

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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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.

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