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E. PROPERTY, PLANT AND EQUIPMENT - NARRATIVE (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 13.7 $ 9.0 $ 5.8
Capitalized interest on construction in progress $ 0.0 $ 0.1