REVENUES (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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 year ended December 31, 2019
	Environmental Services		Safety-Kleen		Corporate			Total
Primary Geographical Markets
United States	$	1,721,322	$	1,220,096	$	(586	)	$	2,940,832
Canada	371,041		98,595		1,722			471,358
Total third party revenues	$	2,092,363	$	1,318,691	$	1,136		$	3,412,190
Sources of Revenue (1)
Technical Services	$	1,120,043	$	—	$	—		$	1,120,043
Field and Emergency Response Services	340,906		—		—			340,906
Industrial Services	514,390		—		—			514,390
Oil, Gas and Lodging Services and Other	117,024		—		1,136			118,160
Safety-Kleen Environmental Services	—		851,520		—			851,520
Safety-Kleen Oil (2)	—		467,171		—			467,171
Total third party revenues	$	2,092,363	$	1,318,691	$	1,136		$	3,412,190

	For the year ended December 31, 2018
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	1,598,402	$	1,196,661	$	1,082	$	2,796,145
Canada	405,441		98,694		23		504,158
Total third party revenues	$	2,003,843	$	1,295,355	$	1,105	$	3,300,303
Sources of Revenue (1)
Technical Services	$	1,037,388	$	—	$	—	$	1,037,388
Field and Emergency Response Services	304,727		—		—		304,727
Industrial Services	541,895		—		—		541,895
Oil, Gas and Lodging Services and Other	119,833		—		1,105		120,938
Safety-Kleen Environmental Services	—		795,077		—		795,077
Safety-Kleen Oil (2)	—		500,278		—		500,278
Total third party revenues	$	2,003,843	$	1,295,355	$	1,105	$	3,300,303

_____________________

(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)

Safety-Kleen Oil was formerly known as Kleen Performance Products

Contract Balances

Contract Balances

(in thousands)	December 31, 2019		December 31, 2018
Receivables	$	644,738	$	606,952
Contract assets (unbilled receivables)	56,326		54,794
Contract liabilities (deferred revenue)	73,370		61,843