REVENUES (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

We disaggregate the Company's third party revenues by geographic location and source of revenue as we believe these categories depict how revenue and cash flows are affected by economic factors (in thousands):


	For the Three Months Ended June 30, 2020
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	403,451	$	228,338	$	(160)	$	631,629
Canada	60,903		17,252		216		78,371
Total third-party revenues	$	464,354	$	245,590	$	56	$	710,000

Sources of Revenue ⁽¹⁾
Technical Services	$	241,929	$	—	$	—	$	241,929
Field and Emergency Response Services	127,353		—		—		127,353
Industrial Services and Other	95,072		—		56		95,128
Safety-Kleen Environmental Services	—		194,872		—		194,872
Safety-Kleen Oil	—		50,718		—		50,718
Total third-party revenues	$	464,354	$	245,590	$	56	$	710,000


	For the Three Months Ended June 30, 2019
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	431,749	$	316,688	$	202	$	748,639
Canada	94,545		25,494		—		120,039
Total third-party revenues	$	526,294	$	342,182	$	202	$	868,678

Sources of Revenue ⁽¹⁾
Technical Services	$	275,908	$	—	$	—	$	275,908
Field and Emergency Response Services	86,722		—		—		86,722
Industrial Services and Other ⁽²⁾	163,664		—		202		163,866
Safety-Kleen Environmental Services	—		216,434		—		216,434
Safety-Kleen Oil	—		125,748		—		125,748
Total third-party revenues	$	526,294	$	342,182	$	202	$	868,678


	For the Six Months Ended June 30, 2020
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	843,465	$	534,871	$	(462)	$	1,377,874
Canada	148,993		41,088		608		190,689
Total third-party revenues	$	992,458	$	575,959	$	146	$	1,568,563

Sources of Revenue ⁽¹⁾
Technical Services	$	517,202	$	—	$	—	$	517,202
Field and Emergency Response Services	233,265		—		—		233,265
Industrial Services and Other	241,991		—		146		242,137
Safety-Kleen Environmental Services	—		409,353		—		409,353
Safety-Kleen Oil	—		166,606		—		166,606
Total third-party revenues	$	992,458	$	575,959	$	146	$	1,568,563


	For the Six Months Ended June 30, 2019
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	819,918	$	603,262	$	796	$	1,423,976
Canada	180,074		45,467		—		225,541
Total third-party revenues	$	999,992	$	648,729	$	796	$	1,649,517

Sources of Revenue⁽¹⁾
Technical Services	$	527,827	$	—	$	—	$	527,827
Field and Emergency Response Services	158,348		—		—		158,348
Industrial Services and Other⁽²⁾	313,817		—		796		314,613

Safety-Kleen Environmental Services	—		423,517		—		423,517
Safety-Kleen Oil	—		225,212		—		225,212
Total third-party revenues	$	999,992	$	648,729	$	796	$	1,649,517

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(1) All revenue except oil and oil product sales within Safety-Kleen Oil and product sales within Safety-Kleen Environmental Services, which include various automotive related fluids, shop supplies and direct blended oil sales, are recognized over time. Safety-Kleen Oil and Safety-Kleen Environmental Services product sales are recognized at a point in time.

(2) Third-party revenues of $27,653 and $202 for the three months ended June 30, 2019, respectively, and third-party revenues of $61,708 and $796 for the six months ended June 30, 2019, respectively, previously reported as Oil, Gas and Lodging Services and Other, are now disclosed within Industrial Services and Other based on relative materiality to the business.

Schedule of Contract Balances


(in thousands)	June 30, 2020		December 31, 2019
Receivables	$	572,373	$	644,738
Contract assets (unbilled receivables)	44,761		56,326
Contract liabilities (deferred revenue)	61,902		73,370