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CAPITAL STOCK - Cash dividends declared (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended 95 Months Ended
Jul. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Aug. 01, 2017
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2020
Dividends Payable [Line Items]                                  
Per Share Amount   $ 0.195   $ 0.165     $ 0.390 $ 0.405                  
Total   $ 20,416 $ 17,226 $ 10,935 $ 15,670                        
Dividend Declared [Member]                                  
Dividends Payable [Line Items]                                  
Per Share Amount           $ 1.680 $ 0.455   $ 0.790 $ 0.960 $ 1.070 $ 1.680 $ 1.680 $ 1.920 $ 2.160 $ 1.395 $ 12.110
Total           $ 70,717 $ 45,460   $ 53,570 $ 54,421 $ 55,814 $ 70,717 $ 41,388 $ 38,748 $ 22,643 $ 4,662 $ 387,423
Dividend Declared [Member] | Subsequent Event [Member]                                  
Dividends Payable [Line Items]                                  
Dividends Payable, Date Declared Jul. 14, 2021                                
Dividends Payable, Date to be Paid Aug. 27, 2021                                
Per Share Amount $ 0.065