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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Gain on transactions with bonds (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of changes in accounting policies, accounting estimates and errors [Abstract]      
Gain on transactions with bonds $ 1,569 $ 0 $ 0