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Stockholders equity and dividend payment, Dividend payment (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Aug. 26, 2021
May 26, 2021
Feb. 25, 2021
Nov. 25, 2020
Sep. 02, 2020
May 26, 2020
Feb. 25, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dividend Payment [Abstract]                    
Total payment $ 3,300 $ 6,800 $ 8,600 $ 34,200 $ 82,000 $ 51,500 $ 47,000 $ 18,749 $ 180,509 $ 214,700
Per common share (in dollars per share) $ 0.02 $ 0.04 $ 0.05 $ 0.20 $ 0.48 $ 0.35 $ 0.32 $ 0.11   $ 1.35