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Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 117,683 $ 114,265
Less accumulated depreciation (58,581) (57,992)
Property and equipment, less accumulated depreciation 59,102 56,273
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 24,231 24,197
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 479 482
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 16,215 15,536
Revenue-generating assets    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 58,320 56,336
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 14,579 13,855
Motor vehicles    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 31 $ 31