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Investments (Details) (USD $) | Sep. 28, 2013 | Dec. 31, 2012
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Investments |  |
Total available-for-sale and trading short term investments, amortized cost | $ 244,481,000 | $ 308,064,000
Total available-for-sale and trading short term investments, fair value | 244,995,000 | 313,379,000
Estimated fair value of fixed rate securities designated as available-for-sale, classified by the contractual maturity date of the security |  |
Due within one year | 658,000 |
Due after one year through three years | 41,940,000 |
Due after three years | 57,131,000 |
Total fixed rate securities | 99,729,000 |
Available-for-sale securities |  |
Investments |  |
Amortized Cost | 214,408,000 | 279,556,000
Fair Value | 214,349,000 | 282,829,000
Money market funds |  |
Investments |  |
Amortized Cost | 78,435,000 | 126,537,000
Fair Value | 78,435,000 | 126,537,000
Money market funds | Denominated in Euros |  |
Investments |  |
Fair Value | 15,898,000 |
Money market funds | Denominated in British pounds |  |
Investments |  |
Fair Value | 7,680,000 |
Money market funds | Denominated in Canadian dollars |  |
Investments |  |
Fair Value | 4,130,000 |
Corporate bonds |  |
Investments |  |
Amortized Cost | 68,411,000 | 67,275,000
Fair Value | 69,038,000 | 69,214,000
U.S. Government agency securities |  |
Investments |  |
Amortized Cost | 20,627,000 | 23,647,000
Fair Value | 20,412,000 | 23,775,000
Emerging markets debt mutual fund |  |
Investments |  |
Amortized Cost | 17,693,000 | 17,693,000
Fair Value | 17,253,000 | 18,734,000
Collateralized mortgage obligations |  |
Investments |  |
Amortized Cost | 15,058,000 | 15,059,000
Fair Value | 15,007,000 | 15,162,000
Asset backed debt securities |  |
Investments |  |
Amortized Cost | 8,926,000 | 12,180,000
Fair Value | 8,967,000 | 12,238,000
U.S. Treasury securities |  |
Investments |  |
Amortized Cost | 5,258,000 | 17,165,000
Fair Value | 5,237,000 | 17,169,000
High yield trading debt securities |  |
Investments |  |
Amortized Cost | 24,445,000 | 21,839,000
Fair Value | 25,195,000 | 23,406,000
Emerging markets trading debt mutual fund |  |
Investments |  |
Amortized Cost | 3,161,000 | 3,046,000
Fair Value | 2,900,000 | 3,237,000
Emerging markets trading debt securities |  |
Investments |  |
Amortized Cost | 1,493,000 | 2,361,000
Fair Value | 1,535,000 | 2,600,000
Other trading investments |  |
Investments |  |
Amortized Cost | 974,000 | 1,262,000
Fair Value | $ 1,016,000 | $ 1,307,000

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