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Investments (Details) (USD $) | Jun. 28, 2014 | Dec. 31, 2013
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Investments |  |
Total available-for-sale and trading short term investments, amortized cost | $ 323,181,000 | $ 290,042,000
Total available-for-sale and trading short term investments, fair value | 325,134,000 | 290,649,000
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 | 1,963,000 |
Due after one year through three years | 45,889,000 |
Due after three years | 49,675,000 |
Total fixed rate securities | 97,527,000 |
Available-for-sale securities |  |
Investments |  |
Amortized Cost | 181,319,000 | 224,314,000
Fair Value | 181,953,000 | 224,076,000
Money market funds |  |
Investments |  |
Amortized Cost | 66,993,000 | 88,430,000
Fair Value | 66,993,000 | 88,430,000
Money market funds | Denominated in Euros |  |
Investments |  |
Fair Value | 6,848,000 |
Money market funds | Denominated in Canadian dollars |  |
Investments |  |
Fair Value | 5,549,000 |
Corporate bonds |  |
Investments |  |
Amortized Cost | 49,306,000 | 69,591,000
Fair Value | 49,921,000 | 70,258,000
U.S. Government agency securities |  |
Investments |  |
Amortized Cost | 43,615,000 | 27,299,000
Fair Value | 43,629,000 | 27,147,000
Asset backed debt securities |  |
Investments |  |
Amortized Cost | 10,791,000 | 8,446,000
Fair Value | 10,791,000 | 8,477,000
Collateralized mortgage obligations |  |
Investments |  |
Amortized Cost | 5,575,000 | 7,597,000
Fair Value | 5,584,000 | 7,600,000
U.S. Treasury securities |  |
Investments |  |
Amortized Cost | 5,039,000 | 5,258,000
Fair Value | 5,035,000 | 5,223,000
Emerging markets debt mutual fund |  |
Investments |  |
Amortized Cost |  | 17,693,000
Fair Value |  | 16,941,000
High yield trading debt securities |  |
Investments |  |
Amortized Cost | 101,802,000 | 49,352,000
Fair Value | 103,163,000 | 50,428,000
Equity mutual fund |  |
Investments |  |
Amortized Cost | 25,087,000 |
Fair Value | 25,017,000 |
Money market funds held in trading accounts |  |
Investments |  |
Amortized Cost | 5,728,000 | 11,033,000
Fair Value | 5,728,000 | 11,033,000
Domestic equity ETF |  |
Investments |  |
Amortized Cost | 4,853,000 |
Fair Value | 5,107,000 |
Emerging markets trading debt mutual fund |  |
Investments |  |
Amortized Cost | 3,282,000 | 3,202,000
Fair Value | 2,988,000 | 2,858,000
Emerging markets trading debt securities |  |
Investments |  |
Amortized Cost | 605,000 | 1,300,000
Fair Value | 621,000 | 1,336,000
Other trading investments |  |
Investments |  |
Amortized Cost | 505,000 | 841,000
Fair Value | $ 557,000 | $ 918,000

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