The following table presents our revenue from contracts with customers disaggregated by revenue source (in thousands):

(1)	We operate in two segments: contract operations and aftermarket services. See Note 23 (“Segments”) for further details regarding our segments.

(2)	Primarily relates to fees associated with owned non-compression equipment.

(3)	Includes $1.6 million and $2.1 million for the three months ended March 31, 2020 and 2019, respectively, related to billable maintenance on owned compressors that was recognized at a point in time. All other contract operations revenue is recognized over time.

(4)	All service revenue within aftermarket services is recognized over time. All OTC parts and components sales revenue is recognized at a point in time.

Performance Obligations

As of March 31, 2020, we had $470.5 million of remaining performance obligations related to our contract operations segment. We have elected to apply the practical expedient to not consider the effects of the time value of money, as the expected time between the transfer of services and payment for such services is less than one year. The remaining performance obligations will be recognized through 2025 as follows (in thousands):


	2020		2021		2022		2023		2024		2025		Total
Remaining performance obligations	$	244,368	$	157,208	$	60,034	$	7,422	$	1,355	$	119	$	470,506

As of March 31, 2020, we elected to apply the practical expedient to not disclose the aggregate transaction price for the remaining performance obligations for aftermarket services as there are no contracts with customers with an original contract term that is greater than one year.

Contract Assets and Liabilities

As of March 31, 2020 and December 31, 2019, our receivables from contracts with customers, net of allowance for credit losses, were $133.5 million and $139.4 million, respectively.

Freight billings to customers for the transport of compression assets, customer-specified modifications of compression assets and milestone billings on aftermarket services often result in a contract liability. As of March 31, 2020 and December 31, 2019, our contract liabilities were $9.4 million and $11.4 million, respectively, which were included in deferred revenue and other liabilities in our condensed consolidated balance sheets. The decrease in the contract liability balance during the three months ended March 31, 2020 was primarily due to revenue deferral of $5.8 million, partially offset by $7.7 million recognized as revenue during the period, each primarily related to freight billings and aftermarket services.