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INTANGIBLE ASSETS - Estimated useful lives (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets with definite lives | $ 16,979 | $ 18,034
Asset Management Solutions | Qwest | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life In Years | 10 years |
Total intangible assets with definite lives | $ 7,600 | 8,083
Tech Ops | ALGS | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life In Years | 10 years |
Total intangible assets with definite lives | $ 80 | 90
Tech Ops | ACS | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life In Years | 10 years |
Total intangible assets with definite lives | $ 1,558 | 1,663
Tech Ops | ACT | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life In Years | 10 years |
Total intangible assets with definite lives | $ 7,741 | $ 8,198

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- Definition Amount after 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 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: 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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