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Transactions with Affiliates
6 Months Ended
Jun. 30, 2021
Related Party Transactions [Abstract]  
Transactions with Affiliates Transactions with Affiliates
We enter into certain transactions in the normal course of business with affiliated entities including direct cost reimbursement for shared phone and administrative services from KSA Industries, Inc. (“KSA”), an affiliated entity. We lease our corporate office space in a building operated by 17 South Briar Hollow Lane, LLC, an affiliate of KSA.

Activities with affiliates were as follows for the periods indicated (in thousands):

Three Months EndedSix Months Ended
June 30,June 30,
2021202020212020
Affiliate billings to us$— $15 $12 $32 
Billings to affiliates
Rentals paid to affiliate143 122 317 244