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GOODWILL AND INTANGIBLE ASSETS - Amortized Intangible Assets - (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 24, 2016 | Sep. 30, 2017 | Sep. 24, 2016 | Dec. 31, 2016
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | $ 215,396 |  | $ 215,396 |  | $ 205,079
Accumulated Amortization | 137,847 |  | 137,847 |  | 121,486
Amortization expense for intangible assets | 4,025 | $ 3,964 | 11,792 | $ 12,037 |
Estimated amortization expense |  |  |  |  |
2015 | 15,823 |  | 15,823 |  |
2016 | 14,492 |  | 14,492 |  |
2017 | 13,718 |  | 13,718 |  |
2018 | 12,608 |  | 12,608 |  |
2019 | 10,474 |  | 10,474 |  |
Customer Relationships |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 200,269 |  | 200,269 |  | 191,316
Accumulated Amortization | 126,845 |  | $ 126,845 |  | $ 111,342
Weighted Average Life |  |  | 13 years |  | 13 years
Proprietary Software & Database |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 3,687 |  | $ 3,687 |  | $ 3,616
Accumulated Amortization | 3,111 |  | $ 3,111 |  | $ 3,056
Weighted Average Life |  |  | 8 years |  | 8 years
Patents & Proprietary Technology |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 6,633 |  | $ 6,633 |  | $ 6,434
Accumulated Amortization | 3,859 |  | $ 3,859 |  | $ 3,420
Weighted Average Life |  |  | 11 years |  | 11 years
Other |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 4,807 |  | $ 4,807 |  | $ 3,713
Accumulated Amortization | $ 4,032 |  | $ 4,032 |  | $ 3,668
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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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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