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BUSINESS ACQUISITIONS (Acquired Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 06, 2017 | Dec. 31, 2017 | Dec. 25, 2016
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Total fair value |  | $ 131,120 | $ 0
Customer relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Total fair value |  | 92,900 | 0
Trade names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Total fair value |  | 38,200 | 0
Non-compete agreement |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Total fair value |  | $ 20 | $ 0
GNP |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Total fair value | $ 131,120 |  |
Weighted average useful life | 15 years 2 months 12 days |  |
GNP | Customer relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Total fair value | $ 92,900 |  |
Weighted average useful life | 13 years |  |
GNP | Trade names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Total fair value | $ 38,200 |  |
Weighted average useful life | 20 years |  |
GNP | Non-compete agreement |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Total fair value | $ 20 |  |
Weighted average useful life | 3 years |  |

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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. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References No definition available. + Details
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