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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Stock-Based Compensation) (Details)
12 Months Ended
Dec. 31, 2020
Phantom Share Units (PSUs) [Member] | PBFX [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 4 years
Minimum [Member] | Performance Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Distribution Percentage Based On Performance Measurements 0.00%
Minimum [Member] | Performance share units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Distribution Percentage Based On Performance Measurements 0.00%
Maximum [Member] | Performance Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Distribution Percentage Based On Performance Measurements 200.00%
Maximum [Member] | Performance share units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Distribution Percentage Based On Performance Measurements 200.00%