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POSTRETIREMENT BENEFITS (cash flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Postretirement benefits [Line Items]
Company contributions	$ 0	$ 0	$ 0
Postretirement benefit plan [Member]
Expected benefit payments
2020	6,089
2021	6,040
2022	5,934
2023	5,767
2024	5,562
2025 - 2029	24,427
Pension plan [Member]
Postretirement benefits [Line Items]
Cash surrender value of insurance polices that fund pension plan	7,136	$ 6,869
Expected benefit payments
2020	320
2021	320
2022	310
2023	300
2024	290
2025 - 2029	$ 1,280