Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Valuation Allowance (Details)

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INCOME TAXES - Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
INCOME TAXES    
Increase in valuation allowance $ 21.6 $ 8.4