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Other Intangible Assets - Gross Amount and Accumulated Impairment Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other Intangible Assets    
Gross amount $ 20,721 $ 20,721
Accumulated impairment loss (6,588)  
Indefinite-lived intangible assets, net $ 14,133 $ 20,721