Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 25, 2017	Jun. 25, 2017	Dec. 25, 2016
Measurement of financial assets and liabilities at fair value on a recurring basis
Transfers among levels within the fair value hierarchy		$ 0
Level 3
Measurement of financial assets and liabilities at fair value on a recurring basis
Impairment loss recorded for assets held for sale	$ 0	0
Carrying Value
Measurement of financial assets and liabilities at fair value on a recurring basis
Cash surrender value of life insurance policies	25,396	25,396	$ 21,690
Interest rate swap liabilities	3,095	3,095	770
Measured on Recurring Basis \| Level 1
Measurement of financial assets and liabilities at fair value on a recurring basis
Cash surrender value of life insurance policies	25,396	25,396	21,690
Measured on Recurring Basis \| Level 2
Measurement of financial assets and liabilities at fair value on a recurring basis
Interest rate swap liabilities	$ 3,095	$ 3,095	$ 770

Amount of transfers of financial instruments between levels of the fair value hierarchy.

No definition available.

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- Definition

Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Surrender Value
-URI http://asc.fasb.org/extlink&oid=6507153

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2611-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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