INTANGIBLE ASSETS AND LIABILITIES - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
INTANGIBLE ASSETS AND LIABILITIES        
Amortization Expense $ 1,637 $ 1,038 $ 4,134 $ 2,646
Increase to Income Properties Revenue (77) (30) (168) (78)
Net Amortization of Intangible Assets and Liabilities $ 1,560 $ 1,008 $ 3,966 $ 2,568