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Discontinued Operations and Related Assets Held for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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     $ (82,565) $ 5,999    
Current Liabilities:            
Total current liabilities of discontinued operations $ 2,761   2,761     $ 3,412
Engineered Solutions [Member] | Discontinued Operations, Held-for-sale [Member]            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]            
Net sales 13 $ 32,428 2,468 64,193    
Cost of sales 142 28,610 1,335 57,022    
Gross (loss) profit (129) 3,818 1,133 7,171    
Research and development 0 711 0 1,281    
Selling and administrative expenses 114 4,106 (244) 7,800    
Gain on sale of assets 0 0 0 0    
Impairment 0 2,800 0 5,300 120,000  
Operating (loss) income (243) (3,799) 1,377 (7,210)    
Other (income) expense   (47)   (18)    
other expenses 72   66      
Interest expense 0 524 0 1,133    
(Loss) income from discontinued operations before income taxes (315) (4,276) 1,311 (8,325)    
Benefit from income taxes on discontinued operations 0 (226) 0 (209)    
Net (loss) income from discontinued operations (315) (4,050) 1,311 (8,116)    
Discontinued Operation, Alternative Cash Flow Information [Abstract]            
Depreciation and amortization     0 2,311    
Impairment 0 2,800 0 5,300 $ 120,000  
Gain on sale of assets 0 $ 0 0 0    
Deferred income taxes     0 (209)    
Capital expenditures     0 $ 432    
Current Assets:            
Accounts receivable 1,234   1,234     3,351
Inventories 191   191     502
Prepaid expenses and other current assets 326   326     1,137
Long-term Assets:            
Net property plant and equipment 0   0     226
Other assets 96   96     97
Total long-term assets of discontinued operations 1,847   1,847     5,313
Current Liabilities:            
Accounts payable 905   905     512
Accrued income and other taxes 181   181     158
Other accrued liabilities 1,675   1,675     2,742
Total current liabilities of discontinued operations 2,761   2,761     3,412
Long-term Liabilities:            
Other long-term obligations 376   376     376
Total liabilities of discontinued operations $ 3,137   $ 3,137     $ 3,788