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Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Goodwill information for each reporting unit |  |  |
Gross carrying amount | $ 204,992 | $ 205,235 |
Accumulated impairment losses | (21,770) | (21,770) |
Net carrying amount | $ 183,222 | $ 183,465 | $ 207,178

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