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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basic and Diluted Income Per Common Share (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Outstanding stock options included in the calculation of diluted EPS 0 5,000 17,000
Outstanding stock options 0    
Antidilutive securities excluded from computation of earnings per share   0 0