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Transactions with Affiliates (Tables)
3 Months Ended
Mar. 31, 2019
Related Party Transactions [Abstract]  
Activities with affiliates
Activities with affiliates were as follows for the periods indicated (in thousands):

Three Months Ended
March 31,
20192018
Affiliate billings to us$17 $15 
Billings to affiliates
Rentals paid to affiliate122 122