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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2021
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 (68,401)   (65,657)
Finite-Lived Intangible Assets, Net 15,429   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 (21,254)   (19,116)
Finite-Lived Intangible Assets, Net $ 13,407   15,545
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years 6 months 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 (4,359)   (3,753)
Finite-Lived Intangible Assets, Net $ 2,022   $ 2,628
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 2 years 5 months 3 years 4 months