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Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost $ 102,764 $ 98,484 $ 95,900
Less accumulated depreciation (73,432) (68,852)  
Total property and equipment and finance lease right-of-use assets, net 29,332 29,632 29,393
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost 2,811 2,811 2,811
Building and improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost 32,803 31,619 30,585
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost 50,087 47,472 46,938
Furniture, fixtures, and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost 12,930 12,593 11,595
Aircraft      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost 4,075 3,910  
Other      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost $ 58 $ 79 $ 61