Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ANTIDILUTIVE SHARES (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ANTIDILUTIVE SHARES (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Outstanding stock-based awards      
Antidilutive shares not included in the computation of income (loss) per share      
Weighted average equivalent shares 0.8 0.8 5.7