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LEASES AND RELATED PARTY LEASES (Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 27, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Leased Assets [Line Items] |  |  |  |
Total rental expense |  | $ 10,300,000 | $ 10,100,000 | $ 10,200,000
Capital leases,future minimum payments |  | 0 |  |
Production equipment purchased |  | 47,328,000 | 33,413,000 | 38,340,000
Related Party |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Total rental expense |  | 300,000 | $ 300,000 | $ 300,000
Payment per year to related party lessor |  | $ 100,000 |  |
Production equipment purchased | $ 400,000 |  |  |
Percent of manufacturing facility owned by corporation whose shareholders are trusts whose beneficiaries include family members of company's former chairman |  | 50.00% |  |
Annual rate of lease agreement |  | $ 300,000 |  |
Related Party | Five-Year Option Lease From November 1, 2032 Through October 31, 2037 |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Option to extend lease, years |  | 5 years |  |
Period for extended lease |  | November 1, 2032 through October 31, 2037 |  |
Related Party | Five-Year Option Lease From November 1, 2037 Through October 31, 2042 |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Option to extend lease, years |  | 5 years |  |
Period for extended lease |  | November 1, 2037 through October 31, 2042 |  |

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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