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Transactions with Affiliates (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Affiliated entities    
Transactions with Affiliates [Abstract]    
Affiliate billings to us $ 15 $ 12
Billings to affiliates 2 1
Rentals paid to affiliate 122 167
Fees paid to Bencap $ 0 $ 108
Bencap LLC [Member]    
Related Party Transaction [Line Items]    
Percentage of equity method investment 0.00%