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Goodwill and Other Intangible Assets - Intangible assets other than goodwill (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Intangible assets subject to amortization      
Gross Carrying Amount $ 192,955 $ 177,395 $ 173,414
Accumulated Amortization (146,395) (131,082) (119,642)
Net Book Value 46,560 46,313 53,772
Intangible assets not subject to amortization      
In-process research and development     229
Total intangible assets Net Book Value 46,560 46,313 54,001
Total intangible assets Gross Carrying Amount   177,395 173,643
Total intangible assets Net Book Value 46,560 $ 46,313 54,001
Maximum      
Intangible assets not subject to amortization      
Estimated useful lives of intangible assets   10 years  
Minimum      
Intangible assets not subject to amortization      
Estimated useful lives of intangible assets   3 years  
Software and technology      
Intangible assets subject to amortization      
Gross Carrying Amount 68,650 $ 66,063 66,251
Accumulated Amortization (62,661) (58,866) (57,937)
Net Book Value $ 5,989 $ 7,197 8,314
Intangible assets not subject to amortization      
Estimated useful lives of intangible assets 3 years 3 years  
Customer relationships      
Intangible assets subject to amortization      
Gross Carrying Amount $ 98,602 $ 88,904 86,364
Accumulated Amortization (68,217) (59,744) (52,753)
Net Book Value $ 30,385 $ 29,160 33,611
Customer relationships | Maximum      
Intangible assets not subject to amortization      
Estimated useful lives of intangible assets 10 years 10 years  
Customer relationships | Minimum      
Intangible assets not subject to amortization      
Estimated useful lives of intangible assets 3 years 3 years  
Trademarks      
Intangible assets subject to amortization      
Gross Carrying Amount $ 25,353 $ 22,278 20,799
Accumulated Amortization (15,466) (12,461) (8,952)
Net Book Value $ 9,887 $ 9,817 11,847
Trademarks | Maximum      
Intangible assets not subject to amortization      
Estimated useful lives of intangible assets 10 years 10 years  
Trademarks | Minimum      
Intangible assets not subject to amortization      
Estimated useful lives of intangible assets 3 years 3 years  
Non-compete agreements      
Intangible assets subject to amortization      
Gross Carrying Amount $ 350 $ 150  
Accumulated Amortization (51) (11)  
Net Book Value $ 299 $ 139  
Intangible assets not subject to amortization      
Estimated useful lives of intangible assets 5 years 5 years  
In Process Research and Development [Member]      
Intangible assets not subject to amortization      
In-process research and development     $ 229