FAIR VALUE (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets (liabilities)
Other long-term assets	$ 4,556	$ 4,835
Recurring basis | Level 1
Assets (liabilities)
Pension plan assets	5,598	6,099
Other long-term assets	4,411	4,690
Recurring basis | Level 2
Assets (liabilities)
Interest rate swaps	$ (2,228)	$ (363)