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Investments (Tables) | 9 Months Ended
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Sep. 27, 2014
Amortized Cost and Fair Value of Available for Sale Investments | The amortized cost and fair values of available-for-sale investments are as follows at September 27, 2014 and December 28, 2013 (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
September 27, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market investments |  | $ | 1,168 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,168 |
Asset-backed securities |  |  | 5,450 |  |  |  | 3 |  |  |  | 55 |  |  |  | 5,398 |
Corporate bonds and direct obligations of government agencies |  |  | 76,924 |  |  |  | 689 |  |  |  | 221 |  |  |  | 77,392 |
U.S. Treasury obligations |  |  | 19,516 |  |  |  | 24 |  |  |  | 8 |  |  |  | 19,532 |
Total |  | $ | 103,058 |  |  | $ | 716 |  |  | $ | 284 |  |  | $ | 103,490 |
December 28, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market investments |  | $ | 2,499 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,499 |
Asset-backed securities |  |  | 4,350 |  |  |  | 19 |  |  |  | 72 |  |  |  | 4,297 |
Corporate bonds and direct obligations of government agencies |  |  | 76,786 |  |  |  | 783 |  |  |  | 370 |  |  |  | 77,199 |
U.S. Treasury obligations |  |  | 18,524 |  |  |  | 31 |  |  |  | 13 |  |  |  | 18,542 |
Total |  | $ | 102,159 |  |  | $ | 833 |  |  | $ | 455 |  |  | $ | 102,537 |
Schedule of Unrealized Loss on Available for Sale Investments | For those available-for-sale investments with unrealized losses at September 27, 2014 and December 28, 2013, the following table summarizes the duration of the unrealized loss (in thousands):
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
September 27, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  | $ | 2,652 |  |  | $ | 13 |  |  | $ | 2,445 |  |  | $ | 42 |  |  | $ | 5,097 |  |  | $ | 55 |
Corporate bonds and direct obligations of government agencies |  |  | 13,264 |  |  |  | 59 |  |  |  | 11,385 |  |  |  | 162 |  |  |  | 24,649 |  |  |  | 221 |
U.S. Treasury obligations |  |  | — |  |  |  | — |  |  |  | 760 |  |  |  | 8 |  |  |  | 760 |  |  |  | 8 |
Total |  | $ | 15,916 |  |  |  | 72 |  |  | $ | 14,590 |  |  | $ | 212 |  |  | $ | 30,506 |  |  | $ | 284 |
December 28, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset -backed securities |  | $ | 3,429 |  |  | $ | 72 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,429 |  |  | $ | 72 |
Corporate bonds and direct obligations of government agencies |  |  | 22,169 |  |  |  | 370 |  |  |  | — |  |  |  | — |  |  |  | 22,169 |  |  |  | 370 |
U.S. Treasury obligations |  |  | 757 |  |  |  | 13 |  |  |  | — |  |  |  | — |  |  |  | 757 |  |  |  | 13 |
Total |  | $ | 26,355 |  |  | $ | 455 |  |  | $ | — |  |  | $ | — |  |  | $ | 26,355 |  |  | $ | 455 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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