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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Percentage of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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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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- 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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- 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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