SEGMENT AND GEOGRAPHIC DISCLOSURES - Segment Data for our Three Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 269,599	$ 302,385
Operating income (loss)	(16,528)	(14,125)
Capital expenditures	6,610	5,487
Depreciation and amortization	12,271	16,455
IHT
Segment Reporting Information [Line Items]
Revenues	127,056	151,419
MS
Segment Reporting Information [Line Items]
Revenues	121,526	132,901
Quest Integrity
Segment Reporting Information [Line Items]
Revenues	21,017	18,065
Operating segments \| IHT
Segment Reporting Information [Line Items]
Revenues	127,056	151,419
Operating income (loss)	1,721	6,740
Capital expenditures	968	2,335
Depreciation and amortization	4,502	4,805
Operating segments \| MS
Segment Reporting Information [Line Items]
Revenues	121,526	132,901
Operating income (loss)	5,534	2,518
Capital expenditures	1,963	1,656
Depreciation and amortization	5,414	9,278
Operating segments \| Quest Integrity
Segment Reporting Information [Line Items]
Revenues	21,017	18,065
Operating income (loss)	1,644	1,094
Capital expenditures	1,328	621
Depreciation and amortization	921	999
Corporate and shared support services
Segment Reporting Information [Line Items]
Operating income (loss)	(25,427)	(24,477)
Capital expenditures	2,351	875
Depreciation and amortization	$ 1,434	$ 1,373

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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