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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]                
Net income attributable to ordinary equity holders $ 21,012 $ 89,058 $ 23,538 $ 8,997 $ (17,780) $ 18,033 $ 133,608 $ 9,250
Weighted average number of ordinary shares (in thousands of shares) (in shares) 60,740     60,487     60,680 60,408
Basic EPS (in USD per share) $ 0.35     $ 0.15     $ 2.20 $ 0.15
Dilutive effect of share based payments (in thousands of shares) (in shares) 100     772     76 888
Weighted average number of diluted ordinary shares (in thousands of shares) (in shares) 60,840     61,259     60,756 61,296
Diluted EPS (in USD per share) $ 0.35     $ 0.15     $ 2.20 $ 0.15