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REVENUE RECOGNITION
 3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
REVENUE RECOGNITION REVENUE RECOGNITION
Revenues 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 services are derived from processing and non-processing services.
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, 2022 and 2021:
Three Months Ended March 31, 2022
EasternWesternResource SolutionsTotal Revenues
Collection$51,497 $68,034 $— $119,531 
Landfill5,376 14,190 — 19,566 
Transfer11,613 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 
Non-processing— — 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 
Three Months Ended March 31, 2021
EasternWesternResource SolutionsTotal Revenues
Collection$36,076 $61,393 $— $97,469 
Landfill5,403 13,619 — 19,022 
Transfer9,424 7,146 — 16,570 
Transportation48 2,213 — 2,261 
Landfill gas-to-energy268 1,035 — 1,303 
Processing1,126 358 17,272 18,756 
Non-processing— — 34,151 34,151 
Total revenues$52,345 $85,764 $51,423 $189,532 
Transferred at a point-in-time$44 $501 $10,092 $10,637 
Transferred over time52,301 85,263 41,331 178,895 
Total revenues$52,345 $85,764 $51,423 $189,532 
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 $3,794 in the three months ended March 31, 2022 and $1,568 in the three months ended March 31, 2021. 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, 2022 or March 31, 2021 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 $94,967 and $89,232 as of March 31, 2022 and December 31, 2021, 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 $5,500 and $3,404 as of March 31, 2022 and December 31, 2021, 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, 2021 and December 31, 2020 was recognized as revenue during the three months ended March 31, 2022 and March 31, 2021, respectively, when the services were performed.