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Industry Segments - Schedule of reporting information by segment (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Executive severance charges	$ 2,400		$ 2,400
Gain on sale of notes receivable	0	$ 0	11,924	$ 0
Environmental charge				$ 4,000
Executive Severances [Member]
Segment Reporting Information [Line Items]
Severance and benefit	1,800		1,800
Share-based payment arrangement, award accelerated cost	600		600
Material Handling [Member]
Segment Reporting Information [Line Items]
Executive severance charges	900		900
Corporate [Member]
Segment Reporting Information [Line Items]
Executive severance charges	$ 1,500		$ 1,500