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Other Charges (Income), Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income and Expenses [Abstract]      
Other Nonoperating Income (Expense) $ 5,866 $ (8,491) $ 867
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax $ 0 (8,189) $ 0
Business Acquisition, Transaction Costs   $ 1,100