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Transactions with Affiliates (Tables)
6 Months Ended
Jun. 30, 2018
Related Party Transactions [Abstract]  
Activities with affiliates
Activities with affiliates were as follows for the periods indicated (in thousands):

Three Months EndedSix Months Ended
June 30,June 30,
2018201720182017
Affiliate billings to us$25 $24 $40 $36 
Billings to affiliates
Rentals paid to affiliate122 158 244 325 
Fees paid to Bencap (1)
— — — 108 
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(1) Amount represents fees paid to Bencap through the date of the forfeiture of our investment during the first quarter of 2017. As a result of the investment forfeiture, Bencap is no longer an affiliate.