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Industry Segments - Schedule of reporting information by segment (Parenthetical) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Executive severance cost     $ 800  
Gain on sale of notes receivable $ 0 $ 0 0 $ 11,924
Executive Severances [Member]        
Segment Reporting Information [Line Items]        
Severance and benefit $ 500   500  
Share-based payment arrangement, award accelerated cost     300  
Distribution [Member]        
Segment Reporting Information [Line Items]        
Executive severance cost     500  
Material Handling [Member] | Building [Member]        
Segment Reporting Information [Line Items]        
Gain on sale of building     1,000  
Corporate [Member]        
Segment Reporting Information [Line Items]        
Executive severance cost     $ 300