Fair Value of Financial Instruments (Details) (USD $) In Thousands	Jul. 02, 2011	Dec. 31, 2010
Assets:
Cash	$ 19,214	$ 72,422
Cash equivalents	117,031	120,042
Short-term—marketable securities	44,610	31,192
Non-qualified Deferred Compensation Plan	3,677	2,971
Total	184,532	226,627
Liabilities:
Earnout Payment Liability	747	1,365
Non-qualified Deferred Compensation Plan	3,677	2,971
Total	4,424	4,336
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash	0	0
Cash equivalents	82,434	120,042
Short-term—marketable securities	4,419	4,822
Non-Qualified Deferred Compensation Plan	3,677	2,971
Total	90,530	127,835
Liabilities:
Earnout Payment Liability	0	0
Non-Qualified Deferred Compensation Plan	3,677	2,971
Total	3,677	2,971
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash	0	0
Cash equivalents	34,597	0
Short-term—marketable securities	40,191	26,370
Non-Qualified Deferred Compensation Plan	0	0
Total	74,788	26,370
Liabilities:
Earnout Payment Liability	0	0
Non-Qualified Deferred Compensation Plan	0	0
Total	0	0
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash		0
Cash equivalents	0	0
Short-term—marketable securities	0	0
Non-Qualified Deferred Compensation Plan	0	0
Total	0	0
Liabilities:
Earnout Payment Liability	747	1,365
Non-Qualified Deferred Compensation Plan	0	0
Total	747	1,365
Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash	19,214	72,422
Cash equivalents	117,031	120,042
Short-term—marketable securities	44,610	31,192
Non-Qualified Deferred Compensation Plan	3,677	2,971
Total	184,532	226,627
Liabilities:
Earnout Payment Liability	747	1,365
Non-Qualified Deferred Compensation Plan	3,677	2,971
Total	$ 4,424	$ 4,336

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Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities and which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Unrestricted cash available for day-to-day operating needs, for an entity that has cash equivalents, but does not aggregate cash equivalents with cash on the balance sheet.

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