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Investments (Details) (USD $) | Sep. 27, 2014 | Dec. 31, 2013
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Investments |  |
Total available-for-sale and trading short term investments, amortized cost | $ 365,903,000 | $ 290,042,000
Total available-for-sale and trading short term investments, fair value | 362,965,000 | 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 | 815,000 |
Due after one year through three years | 8,374,000 |
Due after three years | 11,229,000 |
Total fixed rate securities | 20,418,000 |
Available-for-sale securities |  |
Investments |  |
Amortized Cost | 87,667,000 | 224,314,000
Fair Value | 87,738,000 | 224,076,000
Money market funds |  |
Investments |  |
Amortized Cost | 62,965,000 | 88,430,000
Fair Value | 62,965,000 | 88,430,000
Money market funds | Denominated in Canadian dollars |  |
Investments |  |
Fair Value | 4,875,000 |
Corporate bonds |  |
Investments |  |
Amortized Cost | 10,389,000 | 69,591,000
Fair Value | 10,439,000 | 70,258,000
U.S. Government agency securities |  |
Investments |  |
Amortized Cost | 10,376,000 | 27,299,000
Fair Value | 10,355,000 | 27,147,000
Asset backed debt securities |  |
Investments |  |
Amortized Cost | 2,224,000 | 8,446,000
Fair Value | 2,244,000 | 8,477,000
Collateralized mortgage obligations |  |
Investments |  |
Amortized Cost | 1,192,000 | 7,597,000
Fair Value | 1,214,000 | 7,600,000
U.S. Treasury securities |  |
Investments |  |
Amortized Cost | 521,000 | 5,258,000
Fair Value | 521,000 | 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 | 191,459,000 | 49,352,000
Fair Value | 188,645,000 | 50,428,000
Equity mutual fund |  |
Investments |  |
Amortized Cost | 65,088,000 |
Fair Value | 65,050,000 |
Domestic equity ETF |  |
Investments |  |
Amortized Cost | 14,877,000 |
Fair Value | 15,203,000 |
Emerging markets trading debt mutual fund |  |
Investments |  |
Amortized Cost | 3,309,000 | 3,202,000
Fair Value | 2,849,000 | 2,858,000
Emerging markets trading debt securities |  |
Investments |  |
Amortized Cost | 1,678,000 | 1,300,000
Fair Value | 1,660,000 | 1,336,000
Money market funds held in trading accounts |  |
Investments |  |
Amortized Cost | 390,000 | 11,033,000
Fair Value | 390,000 | 11,033,000
Other trading investments |  |
Investments |  |
Amortized Cost | 1,435,000 | 841,000
Fair Value | $ 1,430,000 | $ 918,000

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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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