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Summary of Significant Accounting Policies (Marketable Securities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 25, 2019 | Dec. 26, 2018 | Dec. 27, 2017
Investment [Line Items] |  |  |
Marketable securities | $ 3,649 | $ 1,709 |
Marketable securities, gain (loss) | 3,000 | (1,000) | $ 1,600
Aggregated Cost |  |  |
Investment [Line Items] |  |  |
Marketable securities | 3,500 | 1,700 |
Estimate of Fair Value Measurement |  |  |
Investment [Line Items] |  |  |
Marketable securities | 3,600 | 1,700 |
Investments |  |  |
Investment [Line Items] |  |  |
Marketable securities, gain (loss) | $ 200 | $ 100 |

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- Definition Amount of investment in marketable security, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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