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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes        
US federal corporate tax rate   35.00% 34.00% 34.00%
Forecast        
Income Taxes        
US federal corporate tax rate 21.00%