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GOODWILL AND INTANGIBLE ASSETS - Analysis of goodwill and intangible assets (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill |  |  |  |
Goodwill, gross |  | $ 97,092,000 | $ 42,237,000 | $ 42,237,000
Accumulated translation adjustment |  | 4,911,000 | 4,911,000 | 4,911,000
Goodwill, net of accumulated translation adjustment | $ 102,003,000 | 102,003,000 | 47,148,000 | 47,148,000
Acquired during the year |  | 54,855,000 |  |
Intangible assets with an indefinite life |  |  |  |
Gross amount |  | 120,784,000 | 26,036,000 | 26,036,000
Accumulated translation adjustment |  | 0 | 0 | 0
Intangible assets with an indefinite life, net | 120,784,000 | 120,784,000 | 26,036,000 |
Acquired during the year |  | 94,748,000 |  |
Intangible assets with a finite life |  |  |  |
Gross amount |  | 410,575,000 | 23,030,000 | 23,030,000
Accumulated amortization |  | (66,534,000) | (11,165,000) | (9,356,000)
Accumulated translation adjustment |  | 0 | 0 | 0
Intangible assets with a finite life, net | 156,498,000 | 344,041,000 | 11,865,000 | 13,674,000
Acquired during the year |  | 387,545,000 |  |
Amortization | (184,043,000) | (55,369,000) | (1,809,000) |
Impairment charge | (3,500,000) |  |  |
Total |  |  |  |
Gross amount |  | 628,451,000 | 91,303,000 | 91,303,000
Accumulated amortization |  | (66,534,000) | (11,165,000) | (9,356,000)
Accumulated translation adjustment |  | 4,911,000 | 4,911,000 | 4,911,000
Goodwill and intangible assets net balance | 379,285,000 | 566,828,000 | 85,049,000 | $ 86,858,000
Acquired during the year |  | 537,148,000 |  |
Amortization | (184,043,000) | (55,369,000) | (1,809,000) |
Impairment charge | $ (3,500,000) | $ 0 | $ 0 |

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