Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Employee Benefit Plans
Deferred compensation plan assets, noncurrent	$ 28,600	$ 21,700
Deferred compensation liability classified, noncurrent	$ 28,690	$ 22,047
Employer discretionary matching contribution made to 401(k) plan and non-qualified deferred compensation plan, percentage	3.00%	3.00%	3.00%
Maximum employee contribution percentage eligible for employer match	6.00%	6.00%	6.00%
Costs of 401(k) plan and non-qualified deferred compensation plan	$ 2,300	$ 2,600	$ 1,500

Percentage of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

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- Definition

The maximum employee contribution percentage that is eligible for an employer match.

+ References

No definition available.

+ Details

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ 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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Balance Type:	debit
Period Type:	duration