REVENUE RECOGNITION

A table of revenues disaggregated by service line and timing of revenue recognition by operating segment for each of the three months ended March 31, 2019 and 2018 follows:

Three Months Ended March 31, 2019



	Eastern		Western		Recycling		Other		Total Revenues
Collection	$	33,965	$	49,597	$	—	$	—	$	83,562
Landfill	3,717		15,468		—		—		19,185
Transfer	8,986		5,275		—		—		14,261
Customer solutions	—		—		—		18,154		18,154
Recycling	—		441		10,766		—		11,207
Organics	—		—		—		13,596		13,596
Transportation	—		2,046		—		517		2,563
Landfill gas-to-energy	329		807		—		—		1,136
Total revenues	$	46,997	$	73,634	$	10,766	$	32,267	$	163,664

Transferred at a point-in-time	$	36	$	309	$	6,124	$	267	$	6,736
Transferred over time	46,961		73,325		4,642		32,000		156,928
Total revenues	$	46,997	$	73,634	$	10,766	$	32,267	$	163,664

Three Months Ended March 31, 2018



	Eastern		Western		Recycling		Other		Total Revenues
Collection	$	30,523	$	36,484	$	—	$	—	$	67,007
Landfill	5,960		14,540		—		—		20,500
Transfer	7,560		5,606		—		—		13,166
Customer solutions	—		—		—		15,170		15,170
Recycling	—		948		10,157		—		11,105
Organics	—		—		—		12,200		12,200
Transportation	—		5,824		—		684		6,508
Landfill gas-to-energy	462		1,337		—		—		1,799
Total revenues	$	44,505	$	64,739	$	10,157	$	28,054	$	147,455

Transferred at a point-in-time	$	191	$	368	$	7,257	$	357	$	8,173
Transferred over time	44,314		64,371		2,900		27,697		139,282
Total revenues	$	44,505	$	64,739	$	10,157	$	28,054	$	147,455

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 $1,338 and $1,468 in the three months ended March 31, 2019 and March 31, 2018, 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. These payments were previously recorded as a cost of operations. We did not record any revenues in the three months ended March 31, 2019 and March 31, 2018, respectively, from performance obligations satisfied in previous periods.

Contract receivables, which are included in Accounts receivable - trade, 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 - trade, net includes gross receivables from contracts of $70,722 and $73,500 as of March 31, 2019 and December 31, 2018, 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 $2,315 and $3,074 as of March 31, 2019 and December 31, 2018, 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, 2018 and December 31, 2017 were recognized as revenue during the three months ended March 31, 2019 and March 31, 2018, respectively, when the services were performed.