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Debt - Long-term and Short-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Short-term debt $ 3,273 $ 3,094
Total 485,178 478,895
Less: portion due within one year 10,795 799
Long-term debt 474,383 478,096
Total debt 488,451 481,989
Loans Payable | Revolving Credit Facility    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Total 478,948 472,495
Loans Payable | Revolving Credit Facility | Handy & Harman Ltd. (HNH)    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Total 741 796
Other Domestic Debt | Handy & Harman Ltd. (HNH)    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Total 5,489 5,604
Foreign Debt    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Short-term debt $ 3,273 $ 3,094