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Revenue from Contract with Customers
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer  
Revenue from Contracts with Customers

17. Revenue from Contracts with Customers

The following table presents our revenue from contracts with customers by segment (see Note 22 (“Segments”)) and disaggregated by revenue source:

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Year Ended December 31, 

(in thousands)

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2021

    

2020

    

2019

Contract operations:

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0 ― 1,000 horsepower per unit

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$

175,457

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$

224,702

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$

259,985

1,001 ― 1,500 horsepower per unit

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267,191

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305,185

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316,082

Over 1,500 horsepower per unit

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204,893

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206,749

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191,510

Other (1)

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770

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2,282

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3,962

Total contract operations revenue (2)

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648,311

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738,918

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771,539

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Aftermarket services:

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Services (3)

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69,876

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79,012

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122,076

OTC parts and components sales

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63,274

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57,040

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71,870

Total aftermarket services revenue (4)

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133,150

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136,052

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193,946

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Total revenue

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$

781,461

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$

874,970

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$

965,485

(1)Primarily relates to fees associated with owned non-compression equipment.
(2)Includes $4.0 million, $5.6 million and $7.9 million during the years ended December 31, 2021, 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.
(3)Includes a reversal of $0.9 million of revenue during the year ended December 31, 2019 related to changes in estimates of performance obligations partially satisfied in prior periods.
(4)Services revenue within aftermarket services is recognized over time. OTC parts and components sales revenue is recognized at a point in time.

Performance Obligations

As of December 31, 2021, we had $264.6 million of remaining performance obligations related to our contract operations segment, which will be recognized through 2026 as follows:

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(in thousands)

    

2022

    

2023

    

2024

    

2025

    

2026

    

Total

Remaining performance obligations

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$

209,241

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$

42,367

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$

11,747

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$

771

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$

471

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$

264,597

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We do 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

Contract Assets

As of December 31, 2021 and 2020, our receivables from contracts with customers, net of allowance for credit losses, were $84.7 million and $95.6 million, respectively.

Contract Liabilities

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. Our contract liabilities were $4.4 million and $4.6 million as of December 31, 2021 and 2020, respectively, and were included in deferred revenue and other liabilities in our consolidated balance sheets. During the year ended December 31, 2021, we deferred revenue of $10.2 million and recognized $10.4 million as revenue. The revenue recognized and deferred during the period primarily related to freight billings and milestone billings on aftermarket services.