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Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 29, 2014 | Dec. 31, 2013
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Investments |  |
Total available-for-sale and trading short term investments, amortized cost | $ 390,973 | $ 290,042
Total available-for-sale and trading short term investments, fair value | 392,222 | 290,649
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 | 5,378 |
Due after one year through three years | 44,186 |
Due after three years | 48,331 |
Total fixed rate securities | 97,895 |
Available-for-sale securities |  |
Investments |  |
Amortized Cost | 334,485 | 224,314
Fair Value | 334,818 | 224,076
Money market funds |  |
Investments |  |
Amortized Cost | 216,623 | 88,430
Fair Value | 216,623 | 88,430
Money market funds | Denominated in Euros |  |
Investments |  |
Fair Value | 6,329 |
Money market funds | Denominated in Canadian dollars |  |
Investments |  |
Fair Value | 3,359 |
Corporate bonds |  |
Investments |  |
Amortized Cost | 49,044 | 69,591
Fair Value | 49,482 | 70,258
U.S. Government agency securities |  |
Investments |  |
Amortized Cost | 47,620 | 27,299
Fair Value | 47,554 | 27,147
Asset backed debt securities |  |
Investments |  |
Amortized Cost | 11,949 | 8,446
Fair Value | 11,938 | 8,477
Collateralized mortgage obligations |  |
Investments |  |
Amortized Cost | 6,441 | 7,597
Fair Value | 6,451 | 7,600
U.S. Treasury securities |  |
Investments |  |
Amortized Cost | 2,808 | 5,258
Fair Value | 2,770 | 5,223
Emerging markets debt mutual fund |  |
Investments |  |
Amortized Cost |  | 17,693
Fair Value |  | 16,941
High yield trading debt securities |  |
Investments |  |
Amortized Cost | 50,696 | 49,352
Fair Value | 51,923 | 50,428
Emerging markets trading debt mutual fund |  |
Investments |  |
Amortized Cost | 3,238 | 3,202
Fair Value | 2,856 | 2,858
Money market funds held in trading accounts |  |
Investments |  |
Amortized Cost | 1,287 | 11,033
Fair Value | 1,287 | 11,033
Emerging markets trading debt securities |  |
Investments |  |
Amortized Cost | 712 | 1,300
Fair Value | 729 | 1,336
Other trading investments |  |
Investments |  |
Amortized Cost | 555 | 841
Fair Value | $ 609 | $ 918

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