DISCONTINUED OPERATIONS - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Major classes of line items constituting income (loss) from discontinued operations
Revenues	$ 29,441	$ 19,531	$ 88,704	$ 59,858
Net income (loss) from discontinued operations	3,747	(736)	16,268	3,980
Carrying amount of major classes of assets included as part of discontinued operations
Accounts receivable, net	25,640		25,640		$ 20,499
Prepaid expenses and other current assets	8,077		8,077		3,805
Carrying amounts of major classes of liabilities included as part of discontinued operations
Other accrued liabilities	13,162		13,162		9,363
Quest Integrity
Major classes of line items constituting income (loss) from discontinued operations
Revenues	29,441	19,531	88,704	59,858
Operating expenses	(12,052)	(10,720)	(39,508)	(32,878)
Selling, general and administrative expenses	(8,832)	(7,109)	(26,422)	(19,531)
Restructuring and other related charges, net	0	0	0	(297)
Interest expense, net	(78)	(61)	(108)	(204)
Other expense	(2,675)	(856)	(4,934)	(1,964)
Income before income taxes from discontinued operations	5,804	785	17,732	4,984
Provision for income taxes	(2,057)	(1,521)	(1,464)	(1,004)
Net income (loss) from discontinued operations	3,747	$ (736)	16,268	3,980
Carrying amount of major classes of assets included as part of discontinued operations
Cash and cash equivalents	10,641		10,641		10,122
Accounts receivable, net	25,640		25,640		20,499
Prepaid expenses and other current assets	8,077		8,077		3,805
Property, plant and equipment, net	17,131		17,131		15,879
Goodwill and intangible assets, net	25,311		25,311		26,823
Other classes of assets that are not major	1,870		1,870		5,968
Total assets associated with discontinued operations	88,670		88,670		83,096
Carrying amounts of major classes of liabilities included as part of discontinued operations
Accounts payable	1,923		1,923		2,125
Other accrued liabilities	13,162		13,162		9,363
Operating lease obligations	1,812		1,812		2,368
Other classes of liabilities that are not major	2,478		2,478		2,540
Total liabilities associated with discontinued operations	$ 19,375		19,375		$ 16,396
Cash flows provided by operating activities of discontinued operations:
Depreciation and amortization			1,143	2,016
Cash flows provided by investing activities of discontinued operations:
Capital expenditures			$ 3,703	$ 2,365