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Discontinued Operations and Related Assets Held for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]        
Gain on sale of assets       $ 200
Discontinued Operation, Alternative Cash Flow Information [Abstract]        
Gain on sale of assets       200
Inventories $ (28,679) $ 2,718    
Current Liabilities:        
Total current liabilities of discontinued operations 2,849   $ 3,412  
Engineered Solutions [Member] | Discontinued Operations, Held-for-sale [Member]        
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]        
Net sales 2,455 31,765    
Cost of sales 1,193 28,412    
Gross profit 1,262 3,353    
Research and development 0 570    
Selling and administrative expenses 401 3,693    
Gain on sale of assets (759) 0    
Impairment 0 2,500 5,300 120,000
Operating loss 1,620 (3,410)    
Other income (6)      
other expenses   32    
Interest expense 0 607    
Loss from discontinued operations before income taxes 1,626 (4,049)    
(Benefit from) income taxes on discontinued operations 0 (17)    
Net (loss) income from discontinued operations 1,626 (4,066)    
Discontinued Operation, Alternative Cash Flow Information [Abstract]        
Depreciation and amortization 0 1,768    
Impairment 0 2,500 5,300 $ 120,000
Gain on sale of assets (759) 0    
Deferred income taxes 0 17    
Capital expenditures 0 $ 228    
Current Assets:        
Accounts receivable 1,608   3,351  
Inventories 165   502  
Prepaid expenses and other current assets 536   1,137  
Long-term Assets:        
Net property plant and equipment 0   226  
Other assets 97   97  
Total long-term assets of discontinued operations 2,406   5,313  
Current Liabilities:        
Accounts payable 756   512  
Accrued income and other taxes 83   158  
Other accrued liabilities 2,010   2,742  
Total current liabilities of discontinued operations 2,849   3,412  
Long-term Liabilities:        
Other long-term obligations 376   376  
Total liabilities of discontinued operations $ 3,225   $ 3,788