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ACCOUNTING PRONOUNCEMENTS Recently Issued Accounting Pronouncements-Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
ASU 2016-02 Adoption      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating Lease, Liability     $ 22.0
Operating Lease, Right-of-Use Asset     $ 22.0
ASU 2017-07 Adoption      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
ASU 2017-07, Effect of Adoption, Quantification $ 0.2 $ 1.3