CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 6,343us-gaap_NetIncomeLoss	$ 12,363us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,032us-gaap_Depreciation	3,971us-gaap_Depreciation
Amortization of intangibles	1,786us-gaap_AmortizationOfIntangibleAssets	1,856us-gaap_AmortizationOfIntangibleAssets
Loss on sale of property and equipment	0	159
Stock-based compensation expense	4,391us-gaap_ShareBasedCompensation	3,915us-gaap_ShareBasedCompensation
Amortization of premium on marketable securities	286	394
Deferred income taxes	77us-gaap_DeferredIncomeTaxExpenseBenefit	3,864us-gaap_DeferredIncomeTaxExpenseBenefit
Reduction in accounts receivable allowances	(5)us-gaap_ProvisionForDoubtfulAccounts	(15)us-gaap_ProvisionForDoubtfulAccounts
Tax deficiency associated with employee stock plans	(189)	0
Change in operating assets and liabilities:
Accounts receivable	(550)	(4,017)
Inventories	424us-gaap_IncreaseDecreaseInInventories	(5,652)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(227)	1,825
Accounts payable	349	1,088
Taxes payable and accrued liabilities	(1,076)	(5,624)
Deferred income on sales to distributors	2,031	2,116
Net cash provided by operating activities	17,672	16,243
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(3,322)	(4,465)
Payment for acquisition, net of cash acquired	15,365	0
Purchases of marketable securities	0	(24,751)
Proceeds from Sale and Maturity of Available-for-sale Securities	26,785	0
Net cash provided by (used in) investing activities	8,098	(29,216)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans	3,519	7,045
Repurchase of common stock	(841)	0
Payments of dividends to stockholders	(3,519)us-gaap_PaymentsOfDividends	(3,033)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities	(841)	4,012
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	24,929	(8,961)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	60,708	92,928
CASH AND CASH EQUIVALENTS AT END OF PERIOD	85,637	83,967
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	1,295	4,602
Unpaid CamSemi purchase consideration	184	0
Loan applied to CamSemi purchase price	6,600	0
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid (refund) for income taxes, net	$ 657us-gaap_IncomeTaxesPaidNet	$ (1,942)us-gaap_IncomeTaxesPaidNet

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-Glossary Investing Activities

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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