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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 205,079 | $ 215,939 |
Accumulated Amortization | 121,486 | 111,672 |
Amortization expense for intangible assets | 15,935 | 18,339 | $ 18,414
Estimated amortization expense |  |  |
2016 | 15,063 |  |
2017 | 13,434 |  |
2018 | 12,694 |  |
2019 | 11,634 |  |
2020 | 9,586 |  |
Customer Relationships |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | 191,316 | 201,801 |
Accumulated Amortization | $ 111,342 | $ 101,614 |
Weighted Average Life | 13 years | 13 years |
Proprietary Software And Database |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 3,616 | $ 3,571 |
Accumulated Amortization | $ 3,056 | $ 2,966 |
Weighted Average Life | 8 years | 8 years |
Patents & Proprietary Technology |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 6,434 | $ 6,815 |
Accumulated Amortization | $ 3,420 | $ 3,421 |
Weighted Average Life | 11 years | 11 years |
Other |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 3,713 | $ 3,752 |
Accumulated Amortization | $ 3,668 | $ 3,671 |
Weighted Average Life | 3 years | 3 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://www.xbrl.org/2003/role/presentationRef -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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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