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Other Accrued Expenses and Other Liabilities (Notes)
9 Months Ended
Sep. 30, 2021
Accrued Liabilities and Other Liabilities [Abstract]  
Other Income and Other Expense Disclosure [Text Block]
NOTE 7 - ACCOUNTS RECEIVABLE, OTHER ACCRUED EXPENSES AND OTHER LIABILITIES

Accounts Receivable. The following table presents the components of accounts receivable, net of allowance for doubtful accounts, as of the dates indicated:
September 30, 2021December 31, 2020
(in thousands)
Crude oil, natural gas and NGLs sales$343,022 $178,147 
Joint interest billings21,257 35,396 
Other11,104 37,471 
Allowance for doubtful accounts(6,772)(6,763)
Accounts receivable, net$368,611 $244,251 
        
Other Accrued Expenses. The following table presents the components of other accrued expenses as of the dates indicated:
September 30, 2021December 31, 2020
(in thousands)
Employee benefits$24,106 $23,304 
Asset retirement obligations33,875 33,933 
Environmental expenses11,992 10,139 
Operating and finance leases7,532 7,986 
Other8,015 6,353 
Other accrued expenses$85,520 $81,715 

Other Liabilities. The following table presents the components of other liabilities as of the dates indicated:
September 30, 2021December 31, 2020
(in thousands)
Deferred midstream gathering credits$162,112 $168,478 
Deferred oil gathering credits16,583 18,090 
Production taxes87,170 65,592 
Operating and finance leases7,760 10,763 
Other751 1,111 
Other liabilities$274,376 $264,034 

Deferred Midstream Gathering Credits. In the second quarter of 2019, concurrent with the sale of our Delaware Basin midstream assets, we entered into an agreement with each of the purchasers pursuant to which we dedicated the gathering of certain of our production and all water gathering and disposal volumes in the Delaware Basin. The terms of these agreements range from 15 to 22 years. The acreage dedication agreements resulted in initial cash receipts and are being amortized on a units-of-production basis. The amortization rates are assessed on an annual basis for changes in estimated future production.

Deferred Oil Gathering Credits. In 2018, we entered into an agreement that dedicates crude oil from the majority of our Wattenberg Field acreage to the midstream provider’s gathering lines and extends the term of the agreement through December 2029. The acreage dedication agreement resulted in an initial cash receipt and is being amortized on a units-of-production basis. The amortization rates are assessed on an annual basis for changes in estimated future production.
The following table presents the amortization charges recognized on the condensed consolidated statements of operations for the periods indicated:
Three Months Ended September 30,
Nine Months Ended September 30,
2021202020212020
(in thousands)
Crude oil, natural gas and NGLs sales$— $— $— $368 
Transportation, gathering and processing expense2,014 2,038 5,343 4,499 
Lease operating expense732 686 1,817 1,458