Segment Reporting - Sales by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	$ 981,553	$ 971,578	$ 717,699
Gross profit	86,505	118,987	74,076
Selling, general & administrative expenses	66,361	69,406	68,228
Goodwill and other impairment	0	0	29,017
Operating income (loss)	20,144	49,581	(23,169)
Capital expenditures and depreciation expense:
Capital expenditures	19,710	17,653	7,142
Depreciation expense	14,770	15,059	15,059
Vehicle Solutions
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	579,731	498,913	366,636
Electrical Systems
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	180,404	168,971	141,094
Aftermarket & Accessories
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	133,671	115,782	108,314
Industrial Automation
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	87,747	187,912	101,655
Operating Segments | Vehicle Solutions
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	579,731	498,913	366,636
Gross profit	45,979	50,608	32,398
Selling, general & administrative expenses	24,930	26,959	22,510
Goodwill and other impairment			7,245
Operating income (loss)	21,049	23,649	2,643
Capital expenditures and depreciation expense:
Capital expenditures	8,151	6,203	3,599
Depreciation expense	8,343	7,911	7,682
Operating Segments | Electrical Systems
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	180,404	168,971	141,094
Gross profit	23,993	20,773	12,185
Selling, general & administrative expenses	5,775	6,213	3,996
Goodwill and other impairment			1,150
Operating income (loss)	18,218	14,560	7,039
Capital expenditures and depreciation expense:
Capital expenditures	3,936	5,976	857
Depreciation expense	3,496	3,550	3,552
Operating Segments | Aftermarket & Accessories
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	133,671	115,782	108,314
Gross profit	18,836	17,980	16,658
Selling, general & administrative expenses	6,925	5,889	5,396
Goodwill and other impairment			0
Operating income (loss)	11,911	12,091	11,262
Capital expenditures and depreciation expense:
Capital expenditures	3,692	482	358
Depreciation expense	1,323	1,240	1,436
Operating Segments | Industrial Automation
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	87,747	187,912	101,655
Gross profit	(2,303)	29,669	13,205
Selling, general & administrative expenses	5,564	6,106	9,698
Goodwill and other impairment			19,829
Operating income (loss)	(7,867)	23,563	(16,322)
Capital expenditures and depreciation expense:
Capital expenditures	3,702	4,480	1,288
Depreciation expense	503	687	377
Corporate/ Other
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	0	0	0
Gross profit	0	(43)	(370)
Selling, general & administrative expenses	23,167	24,239	26,628
Goodwill and other impairment			793
Operating income (loss)	(23,167)	(24,282)	(27,791)
Capital expenditures and depreciation expense:
Capital expenditures	229	512	1,040
Depreciation expense	$ 1,105	$ 1,671	$ 2,012