OTHER ACCRUED LIABILITIES - Changes in Product Warranty Accrual (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 20,570	$ 22,575
Provision for warranties issued in current year	3,779	3,132
Payments	(2,882)	(4,951)
Balance at end of period	$ 21,467	$ 20,756