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INTANGIBLE ASSETS - Schedule of intangible assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 238,419 | $ 226,267
Finite-Lived Intangible Assets, Accumulated Amortization | (67,505) | (57,328)
Finite-lived intangible assets, net | 170,914 | 168,939
Technology Equipment [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 91,945 | 85,075
Finite-Lived Intangible Assets, Accumulated Amortization | (30,374) | (24,999)
Finite-lived intangible assets, net | 61,571 | 60,076
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 119,166 | 114,171
Finite-Lived Intangible Assets, Accumulated Amortization | (30,426) | (26,880)
Finite-lived intangible assets, net | 88,740 | 87,291
Trademarks and other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 27,308 | 27,021
Finite-Lived Intangible Assets, Accumulated Amortization | (6,705) | (5,449)
Finite-lived intangible assets, net | $ 20,603 | $ 21,572

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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 + Details
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