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LEASES (ASSET RETIREMENT SCHEDULE TABLE) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
LEASES [ABSTRACT]    
Beginning balance, asset retirement obligation $ 1,938 $ 1,861
Additions and modifications 1,153 317
Accretion 14 7
Settlements (623) (247)
Ending balance, asset retirement obligation $ 2,482 $ 1,938