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Earnings per share ("EPS") (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Components of calculation of basic EPS and diluted EPS [Abstract]      
Profit/(loss) for the period used for calculation of EPS - basic $ (11,521) $ 266,266 $ 73,679
Interest and amortization on the convertible notes 0 6,766 12,177
Profit/(loss) for the period used for calculation of EPS - dilutive $ (11,521) $ 273,032 $ 85,856
Basic earnings per share [Abstract]      
Weighted average number of shares (basic) (in shares) 169,089,325 155,712,886 143,437,164
Diluted earnings per share [Abstract]      
Weighted average shares outstanding - basic (in shares) 169,089,325 155,712,886 143,437,164
Dilutive equity awards (in shares) [1] 0 65,873 133,342
Dilutive shares related to convertible notes (in shares) 0 14,275,217 24,589,370
Weighted average shares outstanding - dilutive (in shares) 169,089,325 170,053,975 168,159,876
Antidilutive securities excluded from calculation of diluted weighted average number of shares outstanding (in shares) 77,546    
[1] In 2021, 77,546 equity awards were not included in the calculation of the dilutive weighted average shares outstanding due to being anti-dilutive