FAIR VALUE ACCOUNTING (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Assets:
Pension assets	$ 1,800	$ 1,881
Totals	1,800	1,881
Liabilities:
Derivative liabilities	22,850	24,128	$ 172	$ 369
Totals	22,850	24,128
Fair Value, Inputs, Level 1
Assets:
Pension assets	0	0
Totals	0	0
Liabilities:
Derivative liabilities	0	0
Totals	0	0
Fair Value, Inputs, Level 2
Assets:
Pension assets	0	0
Totals	0	0
Liabilities:
Derivative liabilities	0	0
Totals	0	0
Fair Value, Inputs, Level 3
Assets:
Pension assets	1,800	1,881
Totals	1,800	1,881
Liabilities:
Derivative liabilities	22,850	24,128
Totals	$ 22,850	$ 24,128