Annual report pursuant to Section 13 and 15(d)

PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details)

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PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Depreciation $ 106,800,000 $ 119,200,000 $ 173,000,000
Tangible Asset Impairment Charges 0 0 537,800,000
Depletion $ 3,800,000 $ 7,400,000 79,600,000
Land Rights And Mineral Rights [Member]      
Property, Plant and Equipment [Line Items]      
Tangible Asset Impairment Charges     $ 297.2