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Acquired Intangible Assets (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Total acquired intangible assets |  |  | $ 99,053 |  | $ 99,053 |  | $ 57,128
Less accumulated amortization | [1] |  | (33,805) |  | (33,805) |  | (29,040)
Net acquired intangible assets |  |  | 65,248 |  | 65,248 |  | 28,088
Amortization of acquired intangible assets [Abstract] |  |  |  |  |  |  |
Amortization expense |  |  | 2,200 | $ 1,200 | 4,900 | $ 3,700 |
Estimated amortization expense, remainder of 2016 |  |  | 2,200 |  | 2,200 |  |
Estimated amortization expense in year 2017 |  |  | 8,000 |  | 8,000 |  |
Estimated amortization expense in year 2018 |  |  | 7,600 |  | 7,600 |  |
Estimated amortization expense in year 2019 |  |  | 6,400 |  | 6,400 |  |
Estimated amortization expense in years 2020 through 2031 |  |  | 35,800 |  | 35,800 |  |
Customer Relationships [Member] |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Total acquired intangible assets |  |  | 87,366 |  | 87,366 |  | 48,475
Trademarks and Trade Names [Member] |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Total acquired intangible assets |  |  | 6,800 |  | 6,800 |  | 6,800
Intangible assets acquired [Abstract] |  |  |  |  |  |  |
Amount of acquired indefinite-lived intangible assets |  |  | 5,200 |  | 5,200 |  |
Non-compete Agreements [Member] |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Total acquired intangible assets |  |  | 3,204 |  | 3,204 |  | 970
Patents [Member] |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Total acquired intangible assets |  |  | 723 |  | 723 |  | 723
Supply Agreements [Member] |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Total acquired intangible assets |  |  | 800 |  | 800 |  | 0
Leaseholds [Member] |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Total acquired intangible assets |  |  | $ 160 |  | $ 160 |  | $ 160
General Cable Corporation [Member] |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |
Intangible assets acquired in business acquisition |  | $ 42,400 |  |  |  |  |
General Cable Corporation [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |
Intangible assets acquired in business acquisition |  | $ 39,400 |  |  |  |  |
Estimated useful life of intangible assets |  | 15 years |  |  |  |  |
General Cable Corporation [Member] | Non-compete Agreements [Member] |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |
Intangible assets acquired in business acquisition |  | $ 2,200 |  |  |  |  |
Estimated useful life of intangible assets |  | 5 years |  |  |  |  |
General Cable Corporation [Member] | Supply Agreements [Member] |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |
Intangible assets acquired in business acquisition |  | $ 800 |  |  |  |  |
Estimated useful life of intangible assets |  | 1 year |  |  |  |  |
[1] | Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.

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