Segment Reporting - Sales by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	$ 994,679	$ 981,553	$ 971,578
Gross profit	133,723	86,505	118,987
Selling, general & administrative expenses	85,663	66,361	69,406
Operating income (loss)	48,060	20,144	49,581
Capital expenditures and depreciation expense:
Capital expenditures	19,696	19,710	17,653
Depreciation expense	14,240	14,770	15,059
Vehicle Solutions
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	587,119	579,731	498,913
Electrical Systems
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	228,424	180,404	168,971
Aftermarket & Accessories
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	140,236	133,671	115,782
Industrial Automation
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	38,900	87,747	187,912
Operating Segments | Vehicle Solutions
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	587,119	579,731	498,913
Gross profit	68,129	45,979	50,608
Selling, general & administrative expenses	26,109	24,930	26,959
Operating income (loss)	42,020	21,049	23,649
Capital expenditures and depreciation expense:
Capital expenditures	8,509	8,151	6,203
Depreciation expense	8,199	8,343	7,911
Operating Segments | Electrical Systems
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	228,424	180,404	168,971
Gross profit	35,397	23,993	20,773
Selling, general & administrative expenses	9,107	5,775	6,213
Operating income (loss)	26,290	18,218	14,560
Capital expenditures and depreciation expense:
Capital expenditures	9,096	3,936	5,976
Depreciation expense	3,972	3,496	3,550
Operating Segments | Aftermarket & Accessories
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	140,236	133,671	115,782
Gross profit	27,187	18,836	17,980
Selling, general & administrative expenses	8,144	6,925	5,889
Operating income (loss)	19,043	11,911	12,091
Capital expenditures and depreciation expense:
Capital expenditures	1,762	3,692	482
Depreciation expense	1,313	1,323	1,240
Operating Segments | Industrial Automation
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	38,900	87,747	187,912
Gross profit	3,010	(2,303)	29,669
Selling, general & administrative expenses	4,392	5,564	6,106
Operating income (loss)	(1,382)	(7,867)	23,563
Capital expenditures and depreciation expense:
Capital expenditures	9	3,702	4,480
Depreciation expense	288	503	687
Corporate/ Other
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	0	0	0
Gross profit	0	0	(43)
Selling, general & administrative expenses	37,911	23,167	24,239
Operating income (loss)	(37,911)	(23,167)	(24,282)
Capital expenditures and depreciation expense:
Capital expenditures	320	229	512
Depreciation expense	$ 468	$ 1,105	$ 1,671