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SUBSEQUENT EVENTS (Notes)
9 Months Ended
Sep. 30, 2018
Subsequent Event [Line Items]  
Long-term Debt [Text Block]
14.           SUBSEQUENT EVENTS

On October 15, 2018, the Corporation made a discretionary $50 million prepayment on its $500 million 2013 Notes.

On October 17, 2018, the Corporation entered into an Amended and Restated Credit Agreement to extend the maturity date of its $500 million revolving credit facility from November 2019 through October 2023 and expand the accordion feature by $100 million to $200 million.