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Debt - Long-term and Short-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Short-term debt $ 70 $ 1,800
Total 302,629 336,289
Less: portion due within one year 13,953 14,208
Long-term debt 288,676 322,081
Total debt 302,699 338,089
Loans Payable | Revolving Credit Facility    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Total 297,500 330,700
Loans Payable | Revolving Credit Facility | Handy & Harman Ltd. (HNH)    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Total 329 444
Other Domestic Debt | Handy & Harman Ltd. (HNH)    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Total 4,800 5,145
Foreign Debt    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Short-term debt $ 70 $ 1,800