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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	18 Subsequent Events In January 2020, the collective bargaining agreements with our employees represented by the United Steelworkers and International Brotherhood of Electrical Workers in Lewiston were ratified, resulting in the subsequent recognition of $6.6 million retroactive wage expense, which will be recorded as "Other operating charges, net" in the first quarter of 2020. These new agreements will continue through August 2025. In the first quarter of 2020, the indemnity contingency associated with our sale of the LadySmith facility was settled, resulting in the subsequent release of $1.4 million restricted cash and additional gain of $1.4 million to be recorded as "Other operating charges, net".