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Goodwill - Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount | $ 586,405 |  | $ 586,405 |  | $ 593,037 |
Accumulated Amortization | (279,020) |  | (279,020) |  | (256,155) |
Net | 307,385 |  | 307,385 |  | $ 336,882 |
Amortization of Intangible Assets | 12,645 | $ 13,893 | $ 37,909 | $ 41,252 |  |
Customer Relationships [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-Average Life |  |  | 10 years |  | 10 years |
Gross Carrying Amount | 476,656 |  | $ 476,656 |  | $ 476,176 |
Accumulated Amortization | (274,847) |  | (274,847) |  | (247,206) |
Net | 201,809 |  | $ 201,809 |  | $ 228,970 |
Developed Technology [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-Average Life |  |  | 5 years |  | 5 years |
Gross Carrying Amount | 6,340 |  | $ 6,340 |  | $ 9,140 |
Accumulated Amortization | (2,973) |  | (2,973) |  | (4,435) |
Net | 3,367 |  | $ 3,367 |  | 4,705 |
Other Intangible Assets [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-Average Life |  |  | 5 years |  |  |
Gross Carrying Amount | 2,409 |  | $ 2,409 |  | 6,721 | [1]
Accumulated Amortization | (1,200) |  | (1,200) |  | (4,514) | [1]
Net | 1,209 |  | 1,209 |  | 2,207 | [1]
Trade Names [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount | 101,000 |  | 101,000 |  | 101,000 |
Accumulated Amortization | 0 |  | 0 |  | 0 |
Net | $ 101,000 |  | $ 101,000 |  | $ 101,000 |
Minimum [Member] | Other Intangible Assets [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  | 2 years |
Maximum [Member] | Other Intangible Assets [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  | 5 years |
[1] | Consists of non-competition agreements, sales backlog, and an amortizable trade name with useful lives ranging from two to five years.

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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 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 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 Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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