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GOODWILL AND INTANGIBLE ASSETS - Schedule of intangible assets with definite lives (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Intangible assets with definite lives |  |
Cost | $ 208,100 | $ 225,400
Accumulated Amortization | (122,708) | (107,040)
Total intangible assets with definite lives, net | 85,392 | 118,360
Technology |  |
Intangible assets with definite lives |  |
Cost | 87,700 | 87,700
Accumulated Amortization | (64,069) | (48,166)
Total intangible assets with definite lives, net | 23,631 | 39,534
Customer lists |  |
Intangible assets with definite lives |  |
Cost | 77,300 | 77,300
Accumulated Amortization | (23,141) | (18,560)
Total intangible assets with definite lives, net | 54,159 | 58,740
Trademarks and tradenames |  |
Intangible assets with definite lives |  |
Cost | 16,000 | 17,200
Accumulated Amortization | (11,326) | (9,947)
Total intangible assets with definite lives, net | 4,674 | 7,253
Website content |  |
Intangible assets with definite lives |  |
Cost | 27,100 | 43,200
Accumulated Amortization | (24,172) | (30,367)
Total intangible assets with definite lives, net | $ 2,928 | $ 12,833

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