DISCONTINUED OPERATIONS - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Major classes of line items constituting net income (loss) from discontinued operations
Goodwill impairment charge	$ 0	$ (8,795)
Net income (loss) from discontinued operations	220,166	(1,174)
Carrying amounts of major classes of liabilities included as part of discontinued operations:
Income tax payable		1,939
Quest Integrity Group
Major classes of line items constituting net income (loss) from discontinued operations
Revenues	101,418	80,356
Operating expenses	(45,044)	(43,616)
Selling, general and administrative expenses	(32,230)	(26,663)
Restructuring and other related charges, net	0	(381)
Interest expense, net	(108)	(230)
Other (expense)	(4,390)
Other income		591
Income before income taxes	19,646	1,262
Gain on sale of Quest Integrity	203,351	0
Income before income taxes	222,997	1,262
Provision for income taxes	(2,831)	(2,436)
Net income (loss) from discontinued operations	220,166	(1,174)
Carrying amount of major classes of assets included as part of discontinued operations:
Cash and cash equivalents		10,122
Accounts receivable, net		20,499
Prepaid expenses and other current assets		3,805
Property, plant and equipment, net		15,879
Goodwill and intangible assets, net		26,823
Other classes of assets that are not major		5,968
Total assets associated with discontinued operations		83,096
Carrying amounts of major classes of liabilities included as part of discontinued operations:
Accounts payable		2,125
Other accrued liabilities		9,363
Operating lease obligations		2,368
Other classes of liabilities that are not major		601
Total liabilities associated with discontinued operations		16,396
Cash flows provided by operating activities of discontinued operations:
Depreciation and amortization	1,141	2,616
Cash flows provided by investing activities of discontinued operations:
Capital expenditures	$ 4,146	$ 3,500