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CAPITAL STOCK - Cash dividends declared (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended 92 Months Ended
Oct. 14, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2020
Dividends Payable [Line Items]                          
Per Share Amount   $ 0.190 $ 0.240 $ 0.595 $ 0.720                
Dividend Declared [Member]                          
Dividends Payable [Line Items]                          
Per Share Amount       $ 0.660   $ 0.960 $ 1.070 $ 1.680 $ 1.680 $ 1.920 $ 2.160 $ 1.395 $ 11.525
Total       $ 44,055   $ 54,421 $ 55,814 $ 70,717 $ 41,388 $ 38,748 $ 22,643 $ 4,662 $ 332,448
Dividend Declared [Member] | Subsequent Event [Member]                          
Dividends Payable [Line Items]                          
Per Share Amount $ 0.065