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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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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

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