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Transactions with Affiliates (Tables)
 12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Schedule of activities with affiliates
Activities with affiliates were as follows for the periods indicated (in thousands):

Year Ended December 31,
202020192018
Affiliate billings to us$18 $83 $75 
Billings to affiliates5 5 6 
Rentals paid to affiliate644 487 487