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Stockholders' equity and dividend payment, Stock repurchases (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Stock Repurchases [Abstract]            
Share repurchases (in shares) 1,499,608 2,826,771 1,230,302 3,721,841    
Aggregate consideration $ 8,800 $ 15,900 $ 6,700 $ 22,500 $ 24,758 $ 29,207
Average price (in dollars per share) $ 5.87 $ 5.63 $ 5.47 $ 6.02