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REVENUES
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
REVENUES REVENUES
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, 2020
Environmental ServicesSafety-KleenCorporateTotal
Primary Geographical Markets
United States$1,690,256 $1,049,975 $(674)$2,739,557 
Canada313,825 89,751 964 404,540 
Total third-party revenues$2,004,081 $1,139,726 $290 $3,144,097 
Sources of Revenue (1)
Technical Services$1,062,714 $— $— $1,062,714 
Field and Emergency Response Services461,036 — — 461,036 
Industrial Services and Other480,331 — 290 480,621 
Safety-Kleen Environmental Services— 809,236 — 809,236 
Safety-Kleen Oil— 330,490 — 330,490 
Total third-party revenues$2,004,081 $1,139,726 $290 $3,144,097 
For the year ended December 31, 2019
Environmental ServicesSafety-KleenCorporateTotal
Primary Geographical Markets
United States$1,721,322 $1,220,096 $(586)$2,940,832 
Canada371,041 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 Services340,906 — — 340,906 
Industrial Services and Other (2)
631,414 — 1,136 632,550 
Safety-Kleen Environmental Services— 851,520 — 851,520 
Safety-Kleen Oil— 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 ServicesSafety-KleenCorporateTotal
Primary Geographical Markets
United States$1,598,402 $1,196,661 $1,082 $2,796,145 
Canada405,441 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 Services304,727 — — 304,727 
Industrial Services and Other (3)
661,728 — 1,105 662,833 
Safety-Kleen Environmental Services— 795,077 — 795,077 
Safety-Kleen Oil— 500,278 — 500,278 
Total third-party revenues$2,003,843 $1,295,355 $1,105 $3,300,303 
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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)Environmental Services third-party revenues of $117.0 million and Corporate third party revenues of $1.1 million previously reported as Oil, Gas and Lodging Services and Other for the year ended December 31, 2019 are now reported within Industrial Services and Other based on relative materiality to the business.
(3)Environmental Services third-party revenues of $119.8 million and Corporate third party revenues of $1.1 million previously reported as Oil, Gas and Lodging Services and Other for the year ended December 31, 2018 are now reported within Industrial Services and Other based on relative materiality to the business.
Contract Balances
(in thousands)December 31, 2020December 31, 2019
Receivables$611,534 $644,738 
Contract assets (unbilled receivables)55,681 56,326 
Contract liabilities (deferred revenue)74,066 73,370 
The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets) and customer advances and deposits or deferred revenue (contract liabilities) on the consolidated balance sheet. Generally, billing occurs subsequent to revenue recognition, as a right to payment is not just subject to passage of time,
resulting in contract assets. Contract assets are generally classified as current. The Company sometimes receives advances or deposits from its customers before revenue is recognized, resulting in contract liabilities. These assets and liabilities are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period. The contract liability balances at the beginning of each period presented were generally fully recognized in the subsequent three-month period.
Variable Consideration
The nature of the Company's contracts give rise to certain types of variable consideration, including in limited cases volume discounts. Accordingly, management establishes a revenue allowance to cover the estimated amounts of revenue that may need to be credited to customers' accounts in future periods. The Company estimates the amount of variable consideration to include in the estimated transaction price based on historical experience, anticipated performance and management's best judgment at the time and to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved.
Contract Costs
Contract costs include direct and incremental costs to obtain or fulfill a contract. Parts washer costs include costs of solvent, commissions paid relating to revenue generated from parts washer services, and transportation costs associated with transferring the product picked up from the services as it is returned to the Company’s facilities or a third-party site. Costs related to the treatment of waste include costs for waste receiving, drum movement and storage, waste consolidation and transportation between facilities.
The Company’s contract costs that are subject to capitalization are comprised of costs associated with parts washer services and costs associated with the treatment and disposal of waste. As of December 31, 2020 and 2019, the Company's deferred contract costs totaled $22.8 million and $21.7 million, respectively. Deferred parts washer costs are recognized over the service interval as the customer receives the benefit of the services, and deferred costs related to treatment and disposal of waste are recognized when the corresponding waste is disposed. Deferred costs are included within total current assets in the Company’s consolidated balance sheets. The deferred contract cost balances at the beginning of each period presented were fully recognized in cost of revenue in the subsequent three-month period.