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GOODWILL AND INTANGIBLE ASSETS - Definite Lived Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Intangible assets with definite lives |  |
Cost | $ 225,400 | $ 261,705
Accumulated Amortization | (107,040) | (90,267)
Net | 118,360 | 171,438
Technology |  |
Intangible assets with definite lives |  |
Cost | 87,700 | 116,200
Accumulated Amortization | (48,166) | (48,938)
Net | $ 39,534 | $ 67,262
Technology | Weighted Average |  |
Intangible assets with definite lives |  |
Weighted Average Amortization Life | 4 years 3 months 18 days | 4 years 2 months 12 days
Customer lists |  |
Intangible assets with definite lives |  |
Cost | $ 77,300 | $ 77,300
Accumulated Amortization | (18,560) | (12,452)
Net | $ 58,740 | $ 64,848
Customer lists | Weighted Average |  |
Intangible assets with definite lives |  |
Weighted Average Amortization Life | 13 years 2 months 12 days | 13 years 2 months 12 days
Trademarks and trade names |  |
Intangible assets with definite lives |  |
Cost | $ 17,200 | $ 17,200
Accumulated Amortization | (9,947) | (6,407)
Net | $ 7,253 | $ 10,793
Trademarks and trade names | Weighted Average |  |
Intangible assets with definite lives |  |
Weighted Average Amortization Life | 4 years 10 months 24 days | 4 years 10 months 24 days
Website content |  |
Intangible assets with definite lives |  |
Cost | $ 43,200 | $ 51,000
Accumulated Amortization | (30,367) | (22,467)
Net | $ 12,833 | $ 28,533
Website content | Weighted Average |  |
Intangible assets with definite lives |  |
Weighted Average Amortization Life | 3 years | 3 years
Other |  |
Intangible assets with definite lives |  |
Cost |  | $ 5
Accumulated Amortization |  | (3)
Net |  | $ 2
Other | Weighted Average |  |
Intangible assets with definite lives |  |
Weighted Average Amortization Life |  | 3 years

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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://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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- Definition Amount before 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 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 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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