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Transactions with Affiliates (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Transactions with Affiliates [Abstract]            
Accounts receivable – related party   $ 417   $ 417   $ 0
Affiliated entities            
Transactions with Affiliates [Abstract]            
Affiliate billings to us   0 $ 7 0 $ 28  
Affiliate billings to us   24 27 36 38  
Billings to affiliates   1 1 2 2  
Rentals paid to affiliate   158 155 325 318  
Fees paid to Bencap (1)   $ 0 $ 94 108 $ 130  
Interest income - related party       $ 100    
Bencap LLC            
Related Party Transaction [Line Items]            
Additional funding request $ 500          
Percentage of member interest forfeited 30.00%          
Percentage of equity method investment 30.00% 0.00%   0.00%