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Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 102,245 $ 96,383
Less accumulated depreciation (49,744) (45,750)
Property and equipment, less accumulated depreciation 52,501 50,633
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 24,096 24,060
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 493 478
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 17,520 17,239
Revenue-generating assets    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 43,111 38,066
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 13,166 12,681
Motor vehicles    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 31 $ 31