Discontinued Operations - Statements of Operation By Disposal Group (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income from discontinued operations - Note 18	$ 10,397	$ (302)	$ 1,493	$ 2,609	$ 906	$ 1,554	$ 11,588	$ 5,069
Disposed of by Sale | Cab structures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	24,795			30,770			89,187	98,066
Cost of revenues	33,627			27,970			93,367	88,745
Gross profit	(8,832)			2,800			(4,180)	9,321
Income (loss) before provision for income taxes	(8,832)			2,800			(4,180)	9,321
Provision (benefit) for income taxes of discontinued operations	(425)			670			714	2,261
Gain (loss) on disposition of discontinued operations, net of income taxes	27,221			0			27,221	0
Net income from discontinued operations - Note 18	18,814			2,130			22,327	7,060
Held-for-Sale | Industrial Automation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	5,350			13,020			14,641	31,777
Cost of revenues	5,185			11,205			15,107	30,278
Gross profit	165			1,815			(466)	1,499
Selling, general and administrative expenses	747			1,087			3,009	3,588
Operating income (loss)	(582)			728			(3,475)	(2,089)
Interest expense	64			125			201	398
Income (loss) before provision for income taxes	(646)			603			(3,676)	(2,487)
Provision (benefit) for income taxes of discontinued operations	(38)			124			(746)	(496)
Gain (loss) on disposition of discontinued operations, net of income taxes	(7,809)			0			(7,809)	0
Net income from discontinued operations - Note 18	$ (8,417)			$ 479			$ (10,739)	$ (1,991)