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REVENUE RECOGNITION
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2022 and 2021:
Three Months Ended September 30, 2022
EasternWesternResource SolutionsTotal Revenues
Collection$61,875 $82,242 $— $144,117 
Landfill7,900 20,240 — 28,140 
Transfer station19,525 13,230 — 32,755 
Transportation1,233 4,019 — 5,252 
Landfill gas-to-energy205 1,438 — 1,643 
Processing2,399 734 32,159 35,292 
Non-processing— — 48,069 48,069 
Total revenues$93,137 $121,903 $80,228 $295,268 
Transferred at a point-in-time$115 $439 $12,380 $12,934 
Transferred over time93,022 121,464 67,848 282,334 
Total revenues$93,137 $121,903 $80,228 $295,268 
Three Months Ended September 30, 2021
EasternWesternResource SolutionsTotal Revenues
Collection$48,951 $69,921 $— $118,872 
Landfill6,622 18,201 — 24,823 
Transfer station16,948 10,375 — 27,323 
Transportation54 3,393 — 3,447 
Landfill gas-to-energy269 984 — 1,253 
Processing2,310 649 27,418 30,377 
Non-processing— — 35,874 35,874 
Total revenues$75,154 $103,523 $63,292 $241,969 
Transferred at a point-in-time$43 $296 $19,927 $20,266 
Transferred over time75,111 103,227 43,365 221,703 
Total revenues$75,154 $103,523 $63,292 $241,969 
Nine Months Ended September 30, 2022
EasternWesternResource SolutionsTotal Revenues
Collection$172,671 $228,239 $— $400,910 
Landfill19,819 53,028 — 72,847 
Transfer station48,431 33,055 — 81,486 
Transportation4,470 10,700 — 15,170 
Landfill gas-to-energy727 5,323 — 6,050 
Processing5,602 2,281 93,421 101,304 
Non-processing— — 135,195 135,195 
Total revenues$251,720 $332,626 $228,616 $812,962 
Transferred at a point-in-time$352 $1,467 $46,279 $48,098 
Transferred over time251,368 331,159 182,337 764,864 
Total revenues$251,720 $332,626 $228,616 $812,962 
Nine Months Ended September 30, 2021
EasternWesternResource SolutionsTotal Revenues
Collection$124,389 $199,278 $— $323,667 
Landfill18,143 48,336 — 66,479 
Transfer station39,847 27,498 — 67,345 
Transportation148 8,646 — 8,794 
Landfill gas-to-energy784 2,873 — 3,657 
Processing5,246 1,508 65,721 72,475 
Non-processing— — 104,958 104,958 
Total revenues$188,557 $288,139 $170,679 $647,375 
Transferred at a point-in-time$125 $1,284 $44,964 $46,373 
Transferred over time188,432 286,855 125,715 601,002 
Total revenues$188,557 $288,139 $170,679 $647,375 
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 $5,460 and $15,162 in the three and nine months ended September 30, 2022, respectively, and $4,341 and $8,440 in the three and nine months ended September 30, 2021, respectively. 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 and nine months ended September 30, 2022 or September 30, 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 $111,256 and $89,232 as of September 30, 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 $3,891 and $3,404 as of September 30, 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 nine months ended September 30, 2022 and September 30, 2021, respectively, when the services were performed.