2. REVENUE FROM CONTRACTS WITH CUSTOMERS

The following table summarizes revenue from contracts with customers:



thousands	Three Months Ended September 30, 2018			Nine Months Ended September 30, 2018
Revenue from customers
Service revenues – fee based	$	409,106		$	1,146,099
Service revenues – product based	22,735			67,433
Product sales	78,887			224,089
Total revenue from customers	510,728			1,437,621
Revenue from other than customers
Net gains (losses) on commodity price swap agreements	(3,737		)	(6,351		)
Other	771			1,213
Total revenues and other	$	507,762		$	1,432,483

2. REVENUE FROM CONTRACTS WITH CUSTOMERS (CONTINUED)

Contract balances. Receivables from customers, which are included in Accounts receivable, net on the consolidated balance sheets were $298.2 million and $244.4 million as of September 30, 2018, and December 31, 2017, respectively.

Contract assets primarily relate to accrued deficiency fees WES expects to charge customers once the related performance periods are completed. The following table summarizes the current period activity related to contract assets from contracts with customers:



thousands
Balance at December 31, 2017	$	—
Cumulative effect of adopting Topic 606	5,129
Amounts transferred to Accounts receivable, net from contract assets recognized in the adoption effect ⁽¹⁾	(4,358		)
Additional estimated revenues recognized ⁽²⁾	2,140
Balance at September 30, 2018	$	2,911

Contract assets at September 30, 2018
Other current assets	$	2,748
Other assets	163
Total contract assets from contracts with customers	$	2,911


⁽¹⁾	Includes $(1.7) million for the three months ended September 30, 2018.


⁽²⁾	Includes $(5.0) million for the three months ended September 30, 2018.

Contract liabilities primarily relate to (i) fees that are charged to customers for only a portion of the contract term and must be recognized as revenues over the expected period of customer benefit, (ii) fixed and variable fees under cost of service contracts that are received from customers for which revenue recognition is deferred and (iii) aid in construction payments received from customers that must be recognized over the expected period of customer benefit. The following table summarizes the current period activity related to contract liabilities from contracts with customers:



thousands
Balance at December 31, 2017	$	—
Cumulative effect of adopting Topic 606	120,717
Cash received or receivable, excluding revenues recognized during the period ⁽¹⁾	37,340
Revenues recognized during the period that were included in the adoption effect ⁽²⁾	(10,850		)
Balance at September 30, 2018	$	147,207

Contract liabilities at September 30, 2018
Accrued liabilities	$	8,031
Other liabilities	139,176
Total contract liabilities from contracts with customers	$	147,207


⁽¹⁾	Includes $(3.7) million for the three months ended September 30, 2018.


⁽²⁾	Includes $(8.8) million for the three months ended September 30, 2018, of which $(7.5) million was from a performance obligation satisfied in a previous period related to the arbitration against SWEPI LP (see Note 11).

2. REVENUE FROM CONTRACTS WITH CUSTOMERS (CONTINUED)

Transaction price allocated to remaining performance obligations. Revenues expected to be recognized from certain performance obligations that are unsatisfied (or partially unsatisfied) as of September 30, 2018, are reflected in the following table. WGP applies the optional exemptions in Topic 606 and does not disclose consideration for remaining performance obligations with an original expected duration of one year or less or for variable consideration related to unsatisfied (or partially unsatisfied) performance obligations. Therefore, the following table represents only a small portion of expected future revenues from existing contracts as most future revenues from customers are dependent on future variable customer volumes and in some cases variable commodity prices for those volumes.



thousands
Remainder of 2018	$	124,395
2019	480,211
2020	545,223
2021	524,810
2022	528,900
Thereafter	2,191,811
Total	$	4,395,350