REVENUE

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

REVENUE

3. REVENUE

Performance obligations.  The following table presents estimated revenue expected to be recognized during the remainder of 2021 and over the remaining contract period related to performance obligations that are unsatisfied and are comprised of estimated minimum volume commitments.

	2021		2022		2023		2024		2025		Thereafter
Gathering services and related fees	$	74,014	$	84,215	$	66,330	$	49,872	$	32,996	$	22,078

Revenue by Category.  In the following table, revenue is disaggregated by geographic area and major products and services.  For more detailed information about reportable segments, see Note 15 – Segment Information.

	Three Months Ended March 31, 2021
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(in thousands)
Reportable Segments:
Utica Shale	$	8,572	$	—	$	—	$	8,572
Williston Basin		12,633		12,227		4,506		29,366
DJ Basin		6,263		110		704		7,077
Permian Basin		2,199		6,518		116		8,833
Piceance Basin		24,784		1,853		1,177		27,814
Barnett Shale		9,696		55		1,061		10,812
Marcellus Shale		6,201		—		—		6,201
Total reportable segments		70,348		20,763		7,564		98,675
All other segments		—		—		643		643
Total	$	70,348	$	20,763	$	8,207	$	99,318

	Three Months Ended March 31, 2020
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(in thousands)
Reportable Segments:
Utica Shale	$	6,962	$	—	$	—	$	6,962
Williston Basin		23,797		4,324		3,142		31,263
DJ Basin		6,855		70		1,034		7,959
Permian Basin		2,311		4,512		187		7,010
Piceance Basin		27,189		1,003		1,065		29,257
Barnett Shale		10,443		3,871		1,260		15,574
Marcellus Shale		6,235		—		—		6,235
Total reportable segments		83,792		13,780		6,688		104,260
All other segments		—		—		643		643
Total	$	83,792	$	13,780	$	7,331	$	104,903

Contract balances. Contract assets relate to the Partnership’s rights to consideration for work completed but not billed at the reporting date and consist of the estimated MVC shortfall payments expected from its customers and unbilled activity associated with contributions in aid of construction. Contract assets are transferred to trade receivables when the rights become unconditional. The following table provides information about contract assets from contracts with customers:

	2021
	(In thousands)
Contract assets, January 1,	$	2,026
Additions		2,840
Transfers out		(973	)
Contract assets, March 31,	$	3,893

As of March 31, 2021, receivables with customers totaled $48.3 million and contract assets totaled $3.9 million and were included in the accounts receivable caption on the unaudited condensed consolidated balance sheets.

As of December 31, 2020, receivables with customers totaled $57.5 million and contract assets totaled $2.0 million which were included in the accounts receivable caption on the unaudited condensed consolidated balance sheets.

Contract liabilities (deferred revenue) relate to the advance consideration received from customers primarily for contributions in aid of construction. The Partnership recognizes contract liabilities under these arrangements in revenue over the contract period. For the three months ended March 31, 2021 and 2020, the Partnership recognized $1.1 million and $2.4 million of gathering services and related fees, respectively, which were included in the contract liability balance as of the beginning of the period. See Note 6 – Deferred Revenue for additional details.