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FINANCIAL STATEMENT PRESENTATION - Ability to Continue as a Going Concern (Details) - Senior revolving credit facility - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Current borrowing capacity $ 225.0 $ 275.0
Amount outstanding 105.0  
Outstanding indebtedness in case of default $ 730.0