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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Acquired Finite-Lived Intangible Assets    
Finite-Lived Intangible Assets, Gross $ 83,830 $ 83,830
Finite-Lived Intangible Assets, Accumulated Amortization (66,700) (65,657)
Finite-Lived Intangible Assets, Net 17,130 18,173
Value of Business Acquired    
Acquired Finite-Lived Intangible Assets    
Finite-Lived Intangible Assets, Gross 42,788 42,788
Finite-Lived Intangible Assets, Accumulated Amortization (42,788) (42,788)
Finite-Lived Intangible Assets, Net 0 0
Customer Relationships    
Acquired Finite-Lived Intangible Assets    
Finite-Lived Intangible Assets, Gross 34,661 34,661
Finite-Lived Intangible Assets, Accumulated Amortization (19,957) (19,116)
Finite-Lived Intangible Assets, Net $ 14,704 $ 15,545
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years 6 years 1 month
Trade Names    
Acquired Finite-Lived Intangible Assets    
Finite-Lived Intangible Assets, Gross $ 6,381 $ 6,381
Finite-Lived Intangible Assets, Accumulated Amortization (3,955) (3,753)
Finite-Lived Intangible Assets, Net $ 2,426 $ 2,628
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 3 years 4 months