REVENUE (Tables)

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

A disaggregation of our revenue from contracts with customers by geographic region, by reportable operating segment and by service type is presented below (in thousands):

Geographic area:

	Three Months Ended September 30, 2022						Three Months Ended September 30, 2021
	(unaudited)						(unaudited)
	United States and Canada		Other Countries		Total		United States and Canada		Other Countries		Total
Revenue:
IHT	$	108,009	$	2,303	$	110,312	$	98,812	$	2,664	$	101,476
MS	76,135		31,892		108,027		63,885		32,518		96,403
Total	$	184,144	$	34,195	$	218,339	$	162,697	$	35,182	$	197,879

	Nine Months Ended September 30, 2022						Nine Months Ended September 30, 2021
	(unaudited)						(unaudited)
	United States and Canada		Other Countries		Total		United States and Canada		Other Countries		Total
Revenue:
IHT	$	312,928	$	7,105	$	320,033	$	302,871	$	7,206	$	310,077
MS	217,749		91,135		308,884		189,234		91,732		280,966
Total	$	530,677	$	98,240	$	628,917	$	492,105	$	98,938	$	591,043

Operating segment and service type:

	Three Months Ended September 30, 2022
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	87,267	$	19	$	16,357	$	6,669	$	110,312
MS	—		106,776		125		1,126		108,027
Total	$	87,267	$	106,795	$	16,482	$	7,795	$	218,339

	Three Months Ended September 30, 2021
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	80,553	$	56	$	11,928	$	8,939	$	101,476
MS	—		95,560		71		772		96,403
Total	$	80,553	$	95,616	$	11,999	$	9,711	$	197,879

	Nine Months Ended September 30, 2022
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	255,419	$	158	$	45,983	$	18,473	$	320,033
MS	—		305,277		238		3,369		308,884
Total	$	255,419	$	305,435	$	46,221	$	21,842	$	628,917

	Nine Months Ended September 30, 2021
	(unaudited)
	Non-Destructive Evaluation and Testing Services		Repair and Maintenance Services		Heat Treating		Other		Total
Revenue:
IHT	$	244,374	$	344	$	42,650	$	22,709	$	310,077
MS	—		278,685		768		1,513		280,966
Total	$	244,374	$	279,029	$	43,418	$	24,222	$	591,043

Contract with Customer, Asset and Liability

The following table provides information about trade accounts receivable, contract assets and contract liabilities as of September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022		December 31, 2021		Change
	(unaudited)
Trade accounts receivable, net1	$	213,684	$	188,772	$	24,912
Contract assets2	$	2,320	$	1,602	$	718
Contract liabilities3	$	2,071	$	313	$	1,758
Trade accounts receivable, contract assets and contract liabilities - discontinued operations4	$	30,000	$	22,366	$	7,634

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1    Includes billed and unbilled amounts, net of allowance for credit losses. See Note 4 - Receivables for details.    

2    Portion of continued operations is included in the “Prepaid expenses and other current assets” line on the condensed consolidated balance sheets.

3    Portion of continued operations is included in the “Other accrued liabilities” line of the condensed consolidated balance sheets.

4    The total of trade accounts receivable, contract assets, contract liabilities and net accounts receivable of discontinued operations, which is included in the respective lines above.