LONG-TERM DEBT AND OTHER LONG-TERM LIABILITIES (Other Long-Term Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Sep. 01, 2020	Aug. 31, 2020	Dec. 31, 2019
Long-term debt and other long-term liabilites [Abstract]
ARO liability	$ 25,688	$ 23,356	$ 24,591	$ 38,984	$ 66,627
Workers' Compensation Liability	7,925	10,164		$ 11,990	$ 11,511
Finance lease obligations	0	3,216
Contract liability	1,788	4,172
Separation benefit plans	2,022	4,201
Gas balancing liability	1,090	3,997
Other long-term liability	0	1,321
Other liabilities	38,513	50,427
Current portion of other long-term liabilities	5,574	11,168	14,960
Other long-term liabilities	$ 32,939	$ 39,259	$ 43,764