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Miscellaneous Expense (Income), Net (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 03, 2017
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 29, 2018
Pension expense (income)     $ 14,845 $ 14,142 $ (7,474)  
Gain on change of control       (2,586) (127)  
Newly available tax regime, resulting in the reduction of interest on these outstanding tax labilities and as a result recorded a gain         4,500  
Charge related to interest on the liabilities     $ 200 $ 500 900  
PT Ferro Materials Utama ("FMU") [Member]            
Business acquisition, percentage of voting interests acquired       66.00%   66.00%
Gain on change of control   $ (2,600)   $ 2,600    
Gardenia Quimica S.A. (“Gardenia”) [Member]            
Gain on change of control $ (2,600)       $ 2,600  
PT Ferro Materials Utama ("FMU") [Member]            
Total ownership       100.00%   100.00%