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Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 113,723 $ 107,618
Less accumulated depreciation (58,454) (54,034)
Property and equipment, less accumulated depreciation 55,269 53,584
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,828 3,828
Building and improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 24,210 24,172
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 501 501
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 18,635 18,022
Revenue-generating assets    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 51,910 47,010
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 14,608 14,054
Motor vehicles    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 31 $ 31