Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES Impairment of 50% or Less Owned Companies Narrative (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES Impairment of 50% or Less Owned Companies Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Recognized impairment charge $ 0 $ 0 $ 0