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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 251,141 | $ 216,035 |
Accumulated Amortization | 143,908 | 142,289 |
Amortization expense for intangible assets | 15,328 | 15,911 | $ 15,935
Estimated amortization expense |  |  |
2016 | 16,170 |  |
2017 | 15,082 |  |
2018 | 13,079 |  |
2019 | 10,976 |  |
2020 | 9,264 |  |
Customer Relationships |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | 219,508 | 200,810 |
Accumulated Amortization | $ 132,180 | $ 131,062 |
Weighted Average Life | 13 years | 13 years |
Patents & Proprietary Technology |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 23,662 | $ 6,693 |
Accumulated Amortization | $ 4,837 | $ 3,999 |
Weighted Average Life | 14 years | 11 years |
Other |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 7,971 | $ 8,532 |
Accumulated Amortization | $ 6,891 | $ 7,228 |
Weighted Average Life | 5 years | 5 years |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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