Segment Information - Segment Description (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 347,900	$ 355,813
Diversified industrial net sales
Segment Reporting Information [Line Items]
Operating Expenses		2,692
Energy net revenue
Segment Reporting Information [Line Items]
Operating Expenses		424
Financial services revenue
Segment Reporting Information [Line Items]
Operating Expenses		(206)
Corporate and Other
Segment Reporting Information [Line Items]
Operating Expenses		206
Management Fee | Diversified industrial net sales
Segment Reporting Information [Line Items]
Total revenue	8,712	6,102
Management Fee | Energy net revenue
Segment Reporting Information [Line Items]
Total revenue	1,573	2,461
Management Fee | Financial services revenue
Segment Reporting Information [Line Items]
Total revenue	$ 850	$ 969