ASSET RETIREMENT OBLIGATIONS (Narrative) (Details) $ in Thousands |
3 Months Ended | |
---|---|---|
Mar. 31, 2020
USD ($)
a
item
property
|
Mar. 31, 2019
USD ($)
|
|
Asset Retirement Obligations [Line Items] | ||
Reclamation activities | $ 5,234 | $ 3,578 |
California [Member] | ||
Asset Retirement Obligations [Line Items] | ||
Reclamation activities | $ 722 | $ 1,266 |
Adjacent aggregates sites | property | 2 | |
Property, acres | a | 90 | |
Number of aggregates locations | item | 3 |