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Goodwill - Net of Impairment (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Goodwill |  |  |
Goodwill | $ 19,798 | $ 19,798 |
Accumulated impairment losses | (19,798) | (11,706) |
Goodwill balance, net of impairment | $ 0 | $ 8,092 | $ 0

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