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Revenue from Contracts with Customers
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers
2. REVENUE FROM CONTRACTS WITH CUSTOMERS

The following table summarizes revenue from contracts with customers:
Year Ended December 31,
thousands202120202019
Revenue from customers
Service revenues – fee based$2,283,584 $2,360,680 $2,388,191 
Service revenues – product based122,584 48,369 70,127 
Product sales290,947 138,559 287,055 
Total revenue from customers2,697,115 2,547,6082,745,373
Revenue from other than customers
Lease revenue (1)
179,251 223,643 — 
Net gains (losses) on commodity-price swap agreements— — (667)
Other789 1,341 1,468 
Total revenues and other$2,877,155 $2,772,592 $2,746,174 
_________________________________________________________________________________________
(1)Includes fixed- and variable-lease revenue from an operating and maintenance agreement entered into with Occidental. See Operating leases within Note 6.

Certain of the Partnership’s midstream services contracts have minimum-volume-commitment demand fees and fees that require periodic rate redeterminations based on the related facility cost-of-service rate provisions. Beginning on December 31, 2020, the Partnership constrained revenue on certain cost-of-service agreements based on the status of commercial negotiations relating to a legal dispute with one of the contract counterparties. As of September 30, 2021, the Partnership determined it was no longer necessary to constrain revenue under these cost-of-service agreements. The Partnership has resolved the legal proceedings and commercial negotiations with the contract counterparties as of December 31, 2021.
2. REVENUE FROM CONTRACTS WITH CUSTOMERS

Contract balances. Receivables from customers, which are included in Accounts receivable, net on the consolidated balance sheets were $424.6 million and $428.2 million as of December 31, 2021 and 2020, respectively.
Contract assets primarily relate to (i) revenue accrued but not yet billed under cost-of-service contracts with fixed and variable fees and (ii) accrued deficiency fees the Partnership expects to charge customers once the related performance periods are completed. The following table summarizes activity related to contract assets from contracts with customers:
Year Ended December 31,
thousands20212020
Contract assets balance at beginning of year
$56,344 $67,357 
Amounts transferred to Accounts receivable, net that were included in the contract assets balance at the beginning of the period(10,380)(7,129)
Additional estimated revenues recognized120 3,877 
Cumulative catch-up adjustment for change in estimated consideration(23,527)(7,761)
Contract assets balance at end of year
$22,557 $56,344 
December 31,
thousands20212020
Other current assets$5,307 $5,338 
Other assets17,250 51,006 
Total contract assets from contracts with customers$22,557 $56,344 

Contract liabilities primarily relate to (i) aid-in-construction payments received from customers that must be recognized 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) 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. The following table summarizes activity related to contract liabilities from contracts with customers:
Year Ended December 31,
thousands20212020
Contract liabilities balance at beginning of year
$266,937 $222,274 
Cash received or receivable, excluding revenues recognized during the period83,326 65,215 
Revenues recognized that were included in the contract liability balance at the beginning of the period(17,265)(13,842)
Cumulative catch-up adjustment for change in estimated consideration(19,852)(6,710)
Contract liabilities balance at end of year
$313,146 $266,937 
December 31,
thousands20212020
Accrued liabilities$27,763 $31,477 
Other liabilities285,383 235,460 
Total contract liabilities from contracts with customers$313,146 $266,937 
2. REVENUE FROM CONTRACTS WITH CUSTOMERS

Transaction price allocated to remaining performance obligations. Revenues expected to be recognized from certain performance obligations that are unsatisfied (or partially unsatisfied) as of December 31, 2021, are presented in the following table. The Partnership applies the optional exemptions in Revenue from Contracts with Customers (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 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
2022$1,056,001 
20231,000,687 
2024971,195 
2025889,113 
2026769,719 
Thereafter1,947,577 
Total$6,634,292