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Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Minimum Pension and Post Retirement Benefit Plan Adjustments, tax $ (225) $ (110) $ (430)