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Transactions with Related Parties (Tables)
 12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Schedule of Transactions With Related Parties Transactions with related parties were as follows:
 
 Year Ended December 31,
 202020192018
Revenues:
Sales of CO2 to Sandhill Group, LLC (1)
$— $— $1,233 
Revenues from services and fees to Poseidon Oil Pipeline Company, LLC (2)
12,902 12,669 12,557 
Revenues from product sales to ANSAC236,408 367,133 373,606 
Expenses:
Amounts paid to our CEO in connection with the use of his aircraft$660 $660 $660 
Charges for products purchased from Poseidon Oil Pipeline Company, LLC (2)
960 975 994 
Charges for services from ANSAC2,460 4,446 5,284 
(1)    We owned a 50% interest in Sandhill Group, LLC which was sold in the third quarter of 2018.
(2)    We own a 64% interest in Poseidon Oil Pipeline Company, LLC.
As of December 31, 2020 and 2019, our receivables from and payables to ANSAC were:
 December 31December 31
 20202019
Receivables:
ANSAC$43,400 $68,075 
Payables:
ANSAC$470 $2,103