CHANGES IN BUSINESS - Discontinued Operation and Disposition (Details) - USD ($) $ in Thousands		12 Months Ended
	May 12, 2021	Dec. 31, 2022	Dec. 31, 2021	Jul. 11, 2018
Liabilities:
Current liabilities of discontinued operations		$ 110	$ 316
Long-term liabilities of discontinued operations		3,479	4,250
Income (loss) before income taxes
Interest expense, net		5,509	5,001
Income (loss) from discontinued operations before income tax		(140)	172
Income tax expense (benefit)		(635)	131
Income from discontinued operations		495	41
Electrical Solutions And Mechanical Solutions
Assets and liabilities
Assets of discontinued operations		0
Discontinued operations, disposed of by means other than sale | Electrical Solutions | Pension
Liabilities:
Liability for pension obligation				$ 2,900
Decrease in liability for pension obligation	$ 300
Income (loss) before income taxes
Loss (gain) on disposal - Electrical Solutions	$ 300
Discontinued operations disposed of by sale | Electrical Solutions And Mechanical Solutions
Liabilities:
Current liabilities of discontinued operations		110	316
Liability for pension obligation		2,244	2,368
Liability for uncertain tax positions		1,235	1,882
Long-term liabilities of discontinued operations		3,479	4,250
Total liabilities of discontinued operations		3,589	4,566
Income (loss) before income taxes
Loss (gain) on disposal - Electrical Solutions		(17)	288
General and administrative expenses		3	40
Interest expense, net		120	76
Income (loss) from discontinued operations before income tax		(140)	172
Income tax expense (benefit)		(635)	131
Income from discontinued operations		495	$ 41
Discontinued operations, held-for-sale or disposed of by sale | Electrical Solutions
Income (loss) before income taxes
Loss (gain) on disposal - Electrical Solutions		$ 300