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The advisory fees and cost reimbursements paid to Pillar, TCI and related parties are detailed below (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Related Party Transactions [Abstract]        
Advisory $ 201 $ 194 $ 599 $ 574
Net income 56 51 250 249
      849 823
Cost reimbursements     220 190
Interest received $ 1,248 $ 1,302 $ 3,697 $ 4,071