Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - DERIVATIVES AND HEDGING ACTIVITIES (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - DERIVATIVES AND HEDGING ACTIVITIES (Details)
12 Months Ended
Dec. 31, 2018
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES  
Quarterly period of effectiveness assessments 3 months
Minimum  
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES  
Derivative designated as a cash flow hedge, effectiveness percentage (as a percent) 80.00%
Maximum  
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES  
Derivative designated as a cash flow hedge, effectiveness percentage (as a percent) 125.00%