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Discontinued Operations and Related Assets Held for Sale (Details) - USD ($)
$ in Thousands
 5 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2018
Jun. 30, 2017
Aug. 14, 2015
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 $ 47,853 $ (82,565) $ 5,999   $ (15,649) 53,548
Current Liabilities:            
Total current liabilities of discontinued operations   2,761     3,412 20,042
Engineered Solutions [Member] | Discontinued Operations, Held-for-sale [Member]            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]            
Net sales 55,608 2,468 64,193 $ 98,024 82,299 115,336
Cost of sales 49,068 1,335 57,022 94,817 74,723 98,440
Gross (loss) profit 6,540 1,133 7,171 3,207 7,576 16,896
Research and development   0 1,281      
Selling and administrative expenses 8,627 (244) 7,800 16,764 12,239 19,220
Gain on sale of assets   0 0   (6,091) 198
Impairment   0 5,300   5,300 120,000
Operating (loss) income (4,143) 1,377 (7,210) (20,228) (5,266) (124,971)
Other (income) expense (135)   (18) (90) (115) (66)
other expenses   66        
Interest expense 918 0 1,133 907 1,133 3,258
(Loss) income from discontinued operations before income taxes (4,926) 1,311 (8,325) (21,045) (6,284) (128,163)
Benefit from income taxes on discontinued operations   0 (209) (2,366) (55) (1,189)
Net (loss) income from discontinued operations (4,926) 1,311 (8,116) $ (18,679) (6,229) (126,974)
Discontinued Operation, Alternative Cash Flow Information [Abstract]            
Depreciation and amortization 4,194 0 2,311   2,418 5,277
Impairment   0 5,300   5,300 120,000
Gain on sale of assets   0 0   (6,091) 198
Inventories 3,514       15,217 (917)
Deferred income taxes   0 (209)   (55) (1,189)
Capital expenditures $ 4,447 0 $ 432   558 4,713
Current Assets:            
Accounts receivable   1,234     3,351 17,094
Inventories   191     502 71,816
Prepaid expenses and other current assets   326     1,137 320
Long-term Assets:            
Net property plant and equipment   0     226 79,048
Other assets   96     97 12,608
Total long-term assets of discontinued operations   1,847     5,313 180,886
Current Liabilities:            
Accounts payable   905     512 7,253
Accrued income and other taxes   181     158  
Other accrued liabilities   1,675     2,742 10,463
Total current liabilities of discontinued operations   2,761     3,412 20,042
Long-term Liabilities:            
Other long-term obligations   376     376 850
Total liabilities of discontinued operations   $ 3,137     $ 3,788 $ 20,892