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Acquired Intangible Assets, Identifiable Intangible Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		$ 124,373	$ 123,636
Less accumulated amortization	[1]	(72,272)	(70,221)
Net acquired intangible assets		52,101	53,415
Customer Relationships [Member]
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		112,440	111,701
Trademarks and Trade Names [Member]
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		6,980	6,980
Non-compete Agreements [Member]
Indefinite Lived Intangible Assets [Abstract]
Total acquired intangible assets		3,270	3,272
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 $2.6 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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