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Stockholders' equity and dividend payment, Dividend payment (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 23, 2022
Nov. 23, 2021
Aug. 26, 2021
May 26, 2021
Feb. 25, 2021
Nov. 25, 2020
Sep. 02, 2020
May 26, 2020
Feb. 25, 2020
Nov. 14, 2019
Aug. 29, 2019
May 28, 2019
Feb. 26, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dividend Payment [Abstract]                                
Total payment   $ 3,300 $ 3,300 $ 6,800 $ 8,600 $ 34,200 $ 82,000 $ 51,500 $ 47,000 $ 7,300 $ 2,800 $ 11,400 $ 7,100 $ 22,083 $ 214,669 $ 28,685
Per common share (in dollars per share)   $ 0.02 $ 0.02 $ 0.04 $ 0.05 $ 0.20 $ 0.48 $ 0.35 $ 0.32 $ 0.05 $ 0.02 $ 0.08 $ 0.05 $ 0.13 $ 1.35 $ 0.20
Subsequent Events [Member]                                
Dividend Payment [Abstract]                                
Per common share (in dollars per share) $ 0.02                              
Dividends payable date Feb. 24, 2022                              
Dividend paid, record date Feb. 17, 2022                              
Dividend paid $ 3,300