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Goodwill and Intangible Assets - Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (178,131) | $ (169,109)
Gross Carrying Amount | 528,440 | 528,157
Net Amortizable Intangibles | 350,309 | 359,048
Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 337,758 | 337,546
Accumulated Amortization | (115,819) | (110,228)
Net Amortizable Intangibles | 221,939 | 227,318
Patents and technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 104,384 | 104,394
Accumulated Amortization | (18,855) | (17,148)
Net Amortizable Intangibles | 85,529 | 87,246
Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 6,259 | 6,245
Accumulated Amortization | (5,694) | (5,600)
Net Amortizable Intangibles | 565 | 645
Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 47,560 | 47,493
Accumulated Amortization | (19,336) | (18,107)
Net Amortizable Intangibles | 28,224 | 29,386
Distributor relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 22,160 | 22,160
Accumulated Amortization | (17,918) | (17,602)
Net Amortizable Intangibles | 4,242 | 4,558
Trademarks |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,319 | 10,319
Accumulated Amortization | (509) | (424)
Net Amortizable Intangibles | $ 9,810 | $ 9,895
Minimum | Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 4 years | 4 years
Minimum | Patents and technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 5 years | 5 years
Minimum | Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 3 years | 3 years
Minimum | Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 10 years | 10 years
Minimum | Distributor relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 8 years | 8 years
Minimum | Trademarks |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 15 years | 15 years
Maximum | Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 15 years | 15 years
Maximum | Patents and technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 17 years | 17 years
Maximum | Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 6 years | 6 years
Maximum | Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 15 years | 15 years
Maximum | Distributor relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 15 years | 15 years

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- Definition Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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