Business Segments, Geographic and Customer Information (EBITDA Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Interest expense-net		$ (32,978)	$ (33,277)	$ (32,951)
Gain (loss) on debt extinguishment	$ (200)	0	0	2,201
Depreciation and amortization		(22,235)	(21,137)	(21,586)
Loss (gain) on disposal of property, plant and equipment - net		(303)	1,318	320
Restructuring		(3,954)	(877)	(2,475)
Corporate transaction-related expenses		(384)	0	0
Corporate share based compensation		(3,354)	(2,709)	(1,119)
Loss from continuing operations before income taxes		(39,415)	(19,699)	(31,016)
Operating Segments
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Segment adjusted EBITDA		36,043	48,726	46,068
Interest expense-net		(769)	(793)	(1,232)
Gain (loss) on debt extinguishment		0	0	(182)
Depreciation and amortization		(21,615)	(20,684)	(21,229)
Loss (gain) on disposal of property, plant and equipment - net		(303)	1,318	320
Loss on divestiture		0	0	(8,730)
Restructuring		(3,791)	(877)	(2,484)
Integration and other restructuring costs		(1,259)	(128)	0
Loss from continuing operations before income taxes		8,306	27,562	12,531
Operating Segments | Industrial
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Segment adjusted EBITDA		20,945	28,979	27,661
Depreciation and amortization		(12,952)	(12,196)	(12,198)
Operating Segments | Engineered Components
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Segment adjusted EBITDA		15,098	19,747	16,348
Operating Segments | Fiber Solutions
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Segment adjusted EBITDA		0	0	2,059
Depreciation and amortization		0	0	(596)
Corporate
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Interest expense-net		(32,209)	(32,484)	(31,719)
Gain (loss) on debt extinguishment		0	0	2,383
Depreciation and amortization		(620)	(453)	(357)
Loss (gain) on disposal of property, plant and equipment - net		0	0	0
Corporate general and administrative expenses		(11,225)	(12,065)	(13,453)
Restructuring		(163)	0	9
Corporate transaction-related expenses		(1,005)	0	0
Integration and other restructuring costs		(131)	36	569
Corporate share based compensation		$ (2,368)	$ (2,295)	$ (979)