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Acquired Intangible Assets, Identifiable Intangible Assets (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		$ 123,457	$ 98,871
Less accumulated amortization	[1]	(57,329)	(51,391)
Net acquired intangible assets		66,128	47,480
Customer Relationships [Member]
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		111,521	87,195
Trademarks [Member]
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		6,980	6,800
Non-compete Agreements [Member]
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		3,273	3,193
Patents [Member]
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		723	723
Supply Agreements [Member]
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		800	800
Leaseholds [Member]
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		$ 160	$ 160
[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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- 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/disclosureRef
-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

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Name Accounting Standards Codification
-Topic 350
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