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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]          
Gain on sale of assets         $ 200
Net (loss) income from discontinued operations $ 3,234 $ 1,134 $ (4,882) $ (107,568)  
Discontinued Operation, Alternative Cash Flow Information [Abstract]          
Gain on sale of assets         200
Inventories     8,588 41,399  
Current Liabilities:          
Total current liabilities of discontinued operations 11,957   11,957   20,042
Long-term Liabilities:          
Other long-term obligations 581   581   850
Engineered Solutions [Member] | Discontinued Operations, Held-for-sale [Member]          
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]          
Net sales 14,528 30,165 78,721 89,184  
Cost of sales 14,574 23,497 71,596 74,051  
Gross profit (46) 6,668 7,125 15,133  
Research and development 106 707 1,387 2,398  
Selling and administrative expenses 3,561 3,983 11,360 13,474  
Gain on sale of assets (3,676) 0 (3,676) 0  
Impairment 0 0 5,300 105,623 120,000
Operating loss (37) 1,978 (7,246) (106,362)  
Other income (56) (3) (71) (75)  
Interest expense 0 783 1,131 2,452  
Loss from discontinued operations before income taxes 19 1,198 (8,306) (108,739)  
(Benefit from) income taxes on discontinued operations (3,215) 64 (3,424) (1,171)  
Net (loss) income from discontinued operations 3,234 1,134 (4,882) (107,568)  
Discontinued Operation, Alternative Cash Flow Information [Abstract]          
Depreciation and amortization     2,418 3,849  
Impairment 0 0 5,300 105,623 120,000
Gain on sale of assets (3,676) $ 0 (3,676) 0  
Inventories     13,804 (217)  
Deferred income taxes     (3,068) (1,172)  
Capital expenditures     528 $ 3,621  
Current Assets:          
Accounts receivable 10,004   10,004   17,094
Inventories 8,092   8,092   71,816
Prepaid expenses and other current assets 2,173   2,173   320
Long-term Assets:          
Net property plant and equipment 8,892   8,892   79,048
Other assets 746   746   12,608
Total long-term assets of discontinued operations 29,907   29,907   180,886
Impairment upon reclassification to discontinued operations (14,532)   (14,532)   (119,907)
Total assets of discontinued operations 15,375   15,375   60,979
Current Liabilities:          
Accounts payable 1,270   1,270   7,253
Accrued income and other taxes 238   238   2,326
Other accrued liabilities 10,449   10,449   10,463
Total current liabilities of discontinued operations 11,957   11,957   20,042
Long-term Liabilities:          
Other long-term obligations 581   581   850
Total liabilities of discontinued operations $ 12,538   $ 12,538   $ 20,892