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Goodwill and Other Intangible Assets - Intangible Assets Other than Goodwill (Details ) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 202,829 $ 191,659
Accumulated Amortization (149,132) (146,032)
Net Book Value $ 53,697 45,627
Software and technology    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 3 years  
Gross Carrying Amount $ 68,501 67,691
Accumulated Amortization (63,646) (63,046)
Net Book Value 4,855 4,645
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 106,976 97,008
Accumulated Amortization (68,043) (66,030)
Net Book Value $ 38,933 30,978
Customer relationships | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 3 years  
Customer relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 10 years  
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 27,002 26,610
Accumulated Amortization (17,357) (16,888)
Net Book Value $ 9,645 9,722
Trademarks | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 3 years  
Trademarks | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 10 years  
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 5 years  
Gross Carrying Amount $ 350 350
Accumulated Amortization (86) (68)
Net Book Value $ 264 $ 282