SEGMENT INFORMATION - Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Capital expenditures	$ 25,790	$ 19,170	$ 27,526
HNH | Operating Segments
Segment Reporting Information [Line Items]
Capital expenditures	18,159	8,881	20,580
ANH | Operating Segments
Segment Reporting Information [Line Items]
Capital expenditures	3,921	6,021	4,424
Specialty Products | Operating Segments
Segment Reporting Information [Line Items]
Capital expenditures	3,003	2,356	1,306
Industrial Products | Operating Segments
Segment Reporting Information [Line Items]
Capital expenditures	$ 707	$ 1,912	$ 1,216