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NON-CONTROLLING INTEREST
6 Months Ended
Jun. 30, 2020
Noncontrolling Interest [Abstract]  
NON-CONTROLLING INTEREST NON-CONTROLLING INTEREST Through our ownership of Polaris Materials Corp., we previously held a 70% interest in Eagle Rock Materials Ltd. ("Eagle Rock"), which was originally formed to develop the Eagle Rock quarry project in British Columbia, Canada. During the six months ended June 30, 2020, all ownership interest in Eagle Rock reverted back to the Company, such that Eagle Rock is now a wholly owned subsidiary. This resulted in the elimination of the previously recorded $3.3 million Eagle Rock non-controlling interest.