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Investments (Tables) | 12 Months Ended
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Dec. 31, 2011
Investments [Abstract] |
Available-For-Sale Investments |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Market Value |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market investments |  | $ | 1,989 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,989 |
Mortgage-backed securities |  |  | 3,017 |  |  |  | 61 |  |  |  | 18 |  |  |  | 3,060 |
Corporate bonds and direct obligations of government agencies |  |  | 51,014 |  |  |  | 819 |  |  |  | 126 |  |  |  | 51,707 |
U.S. Treasury obligations |  |  | 11,682 |  |  |  | 51 |  |  |  | 1 |  |  |  | 11,732 |
Total |  | $ | 67,702 |  |  | $ | 931 |  |  | $ | 145 |  |  | $ | 68,488 |
December 25, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market investments |  | $ | 535 |  |  | $ | — |  |  | $ | — |  |  | $ | 535 |
Mortgage-backed securities |  |  | 3,458 |  |  |  | 64 |  |  |  | 8 |  |  |  | 3,514 |
Corporate bonds and direct obligations of government agencies |  |  | 60,330 |  |  |  | 872 |  |  |  | 151 |  |  |  | 61,051 |
U.S. Treasury obligations |  |  | 12,584 |  |  |  | 6 |  |  |  | 23 |  |  |  | 12,567 |
Total |  | $ | 76,907 |  |  | $ | 942 |  |  | $ | 182 |  |  | $ | 77,667 |
Schedule Of Unrealized Loss On Investments |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Market Value |  |  | Unrealized Loss |  |  | Fair Market Value |  |  | Unrealized Loss |  |  | Fair Market Value |  |  | Unrealized Loss |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 468 |  |  | $ | 18 |  |  | $ | — |  |  | $ | — |  |  | $ | 468 |  |  | $ | 18 |
Corporate bonds and direct obligations of government agencies |  |  | 6,067 |  |  |  | 126 |  |  |  | — |  |  |  | — |  |  |  | 6,067 |  |  |  | 126 |
U.S. Treasury obligations |  |  | 591 |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 591 |  |  |  | 1 |
Total |  | $ | 7,126 |  |  | $ | 145 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,126 |  |  | $ | 145 |
December 25, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 225 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 225 |  |  | $ | 8 |
Corporate bonds and direct obligations of government agencies |  |  | 11,615 |  |  |  | 151 |  |  |  | — |  |  |  | — |  |  |  | 11,615 |  |  |  | 151 |
U.S. Treasury obligations |  |  | 774 |  |  |  | 23 |  |  |  | — |  |  |  | — |  |  |  | 774 |  |  |  | 23 |
Total |  | $ | 12,614 |  |  | $ | 182 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,614 |  |  | $ | 182 |

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- Definition Tabular disclosure of available-for-sale securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=6872113&loc=d3e27290-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: 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=6872113&loc=d3e27357-111563 Reference 8: 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=6872113&loc=d3e27198-111563 Reference 9: 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=6872113&loc=d3e27337-111563 Reference 10: 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=6872113&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 -Topic 320 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 6 -Section 50 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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