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Debt - Long-term and Short-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Short-term debt $ 357 $ 1,800
Total 364,688 336,289
Less: portion due within one year 14,035 14,208
Long-term debt 350,653 322,081
Total debt 365,045 338,089
Loans Payable | Revolving Credit Facility    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Total 359,402 330,700
Loans Payable | Revolving Credit Facility | Handy & Harman Ltd. (HNH)    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Total 370 444
Other Domestic Debt | Handy & Harman Ltd. (HNH)    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Total 4,916 5,145
Foreign Debt    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Short-term debt $ 357 $ 1,800