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Transactions with Affiliates (Tables)
3 Months Ended
Mar. 31, 2021
Related Party Transactions [Abstract]  
Activities with affiliates
Activities with affiliates were as follows for the periods indicated (in thousands):

Three Months Ended
March 31,
20212020
Affiliate billings to us$12 $17 
Billings to affiliates
Rentals paid to affiliate174 122