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Goodwill and Other Intangible Assets - Intangible Assets Other than Goodwill (Details ) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 191,659 $ 177,395
Accumulated Amortization (146,032) (131,082)
Net Book Value $ 45,627 46,313
Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 3 years  
Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 10 years  
Software and technology    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 3 years  
Gross Carrying Amount $ 67,691 66,063
Accumulated Amortization (63,046) (58,866)
Net Book Value 4,645 7,197
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 97,008 88,904
Accumulated Amortization (66,030) (59,744)
Net Book Value $ 30,978 29,160
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 $ 26,610 22,278
Accumulated Amortization (16,888) (12,461)
Net Book Value $ 9,722 9,817
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 $ 350 150
Accumulated Amortization (68) (11)
Net Book Value $ 282 $ 139