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REVENUE RECOGNITION
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
REVENUE RECOGNITION REVENUE RECOGNITIONRevenues associated with our solid waste operations are derived mainly from solid waste collection and disposal services, including landfill, transfer station and transportation services, landfill gas-to-energy services and processing services. Revenues associated with our resource-renewal operations are derived from processing services, and non-processing services, which we now refer to as our National Accounts business.
The following tables set forth revenues disaggregated by service line and timing of revenue recognition by operating segment for each of the three months ended March 31, 2023 and 2022:
Three Months Ended March 31, 2023
EasternWesternResource SolutionsTotal Revenues
Collection$61,108 $78,869 $— $139,977 
Landfill6,301 16,460 — 22,761 
Transfer station13,981 9,961 — 23,942 
Transportation1,183 3,580 — 4,763 
Landfill gas-to-energy213 1,711 — 1,924 
Processing1,123 453 22,806 24,382 
National Accounts— — 44,846 44,846 
Total revenues$83,909 $111,034 $67,652 $262,595 
Transferred at a point-in-time$119 $731 $6,438 $7,288 
Transferred over time83,790 110,303 61,214 255,307 
Total revenues$83,909 $111,034 $67,652 $262,595 
Three Months Ended March 31, 2022
EasternWesternResource SolutionsTotal Revenues
Collection$51,497 $68,034 $— $119,531 
Landfill5,376 14,190 — 19,566 
Transfer station11,613 7,844 — 19,457 
Transportation1,472 2,658 — 4,130 
Landfill gas-to-energy274 2,380 — 2,654 
Processing1,087 733 27,395 29,215 
National Accounts— — 39,474 39,474 
Total revenues$71,319 $95,839 $66,869 $234,027 
Transferred at a point-in-time$120 $511 $15,086 $15,717 
Transferred over time71,199 95,328 51,783 218,310 
Total revenues$71,319 $95,839 $66,869 $234,027 

Payments to customers that are not in exchange for a distinct good or service are recorded as a reduction of revenues. Rebates to certain customers associated with payments for recycled or organic materials that are received and subsequently processed and sold to other third-parties amounted to $6,629 in the three months ended March 31, 2023 and $3,794 in the three months ended March 31, 2022. Rebates are generally recorded as a reduction of revenues upon the sale of such materials, or upon receipt of the recycled materials at our facilities. We did not record any revenues in the three months ended March 31, 2023 or March 31, 2022 from performance obligations satisfied in previous periods.
Contract receivables, which are included in Accounts receivable, net are recorded when billed or when related revenue is earned, if earlier, and represent claims against third-parties that will be settled in cash. Accounts receivable, net includes gross receivables from contracts of $97,340 and $102,234 as of March 31, 2023 and December 31, 2022, respectively. Certain customers are billed in advance and, accordingly, recognition of the related revenues is deferred as a contract liability until the services are provided and control transferred to the customer. We recognized contract liabilities of $4,146 and $3,742 as of March 31, 2023 and December 31, 2022, respectively. Due to the short term nature of advanced billings, substantially all of the deferred revenue recognized as a contract liability as of December 31, 2022 and December 31, 2021 was recognized as revenue during the three months ended March 31, 2023 and March 31, 2022, respectively, when the services were performed.