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Segment Information - Summary of Net Sale and Income (Loss) from Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 199,477	$ 205,683	$ 196,349	$ 169,148	$ 156,135	$ 148,156	$ 157,947	$ 157,555	$ 770,657	$ 619,793	$ 584,954
Income (loss) from operations									(178,888)	33,114	34,779
Income (loss) from continuing operations	$ (220,189)	$ (13,784)	$ (24,511)	$ (5,983)	$ 53,325	$ (3,480)	$ (26,374)	$ 1,893	(264,467)	25,364	$ (9,490)
Paragon Medical
Segment Reporting Information [Line Items]
Net sales									116,998	0
Income (loss) from operations									8,086	0
NN Vandalia
Segment Reporting Information [Line Items]
Net sales									30,668	6,682
Income (loss) from operations									1,532
Income (loss) from continuing operations										(458)
Other
Segment Reporting Information [Line Items]
Net sales									11,968	0
Income (loss) from operations									$ 284	$ 0

X

- Definition

Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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