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

Three Months Ended
March 31,
20202019
Affiliate billings to us$17  $17  
Billings to affiliates  
Rentals paid to affiliate122  122