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Goodwill and Other Intangible Assets - Intangible Assets Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization expenses of intangible assets $ 2,300 $ 2,900 $ 6,600
Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 25,782 25,899  
Accumulated Amortization (23,918) (21,681)  
Net Carrying Amount $ 1,864 $ 4,218  
Weighted average amortization period remaining, in years 10 months 24 days