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Discontinued Operations and Related Assets Held for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
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     $ (93,755) $ 8,588    
Current Liabilities:            
Total current liabilities of discontinued operations $ 3,687   3,687     $ 3,412
Engineered Solutions [Member] | Discontinued Operations, Held-for-sale [Member]            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]            
Net sales 154 $ 14,528 2,622 78,721    
Cost of sales 1,810 14,574 3,145 71,596    
Gross (loss) profit (1,656) (46) (523) 7,125    
Research and development 0 106 0 1,387    
Selling and administrative expenses 64 3,561 (665) 11,360    
Gain on sale of assets (1,048) (3,676) (563) (3,676)    
Impairment 0 0 0 5,300 120,000  
Operating (loss) income (672) (37) 705 (7,246)    
Other (income) expense   (56)   (71)    
other expenses (42)   24      
Interest expense 0 0 0 1,131    
(Loss) income from discontinued operations before income taxes (630) 19 681 (8,306)    
Provision for (benefit from) income taxes on discontinued operations 96 (3,215) 96 (3,424)    
Net (loss) income from discontinued operations (726) 3,234 585 (4,882)    
Discontinued Operation, Alternative Cash Flow Information [Abstract]            
Depreciation and amortization     0 2,418    
Impairment 0 0 0 5,300 $ 120,000  
Gain on sale of assets (1,048) $ (3,676) (563) (3,676)    
Inventories     (263) (13,804)    
Deferred income taxes     96 (3,068)    
Capital expenditures     0 $ 528    
Current Assets:            
Accounts receivable 652   652     3,351
Inventories 239   239     502
Prepaid expenses and other current assets 6   6     1,137
Long-term Assets:            
Net property plant and equipment 84   84     226
Other assets 97   97     97
Total long-term assets of discontinued operations 1,078   1,078     5,313
Current Liabilities:            
Accounts payable 656   656     512
Accrued income and other taxes 182   182     158
Other accrued liabilities 2,849   2,849     2,742
Total current liabilities of discontinued operations 3,687   3,687     3,412
Long-term Liabilities:            
Other long-term obligations 636   636     376
Total liabilities of discontinued operations $ 4,323   $ 4,323     $ 3,788