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Earnings per share ("EPS") (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components of calculation of basic EPS and diluted EPS [Abstract]      
Profit/(loss) for the period used for calculation of EPS - basic $ 266,266 $ 73,679 $ (46,927)
Interest and amortization on the convertible notes 6,766 12,177 0
Profit/(loss) for the period used for calculation of EPS - dilutive $ 273,032 $ 85,856 $ (46,927)
Basic earnings per share [Abstract]      
Weighted average number of shares (basic) (in shares) 155,712,886 143,437,164 143,429,610
Diluted earnings per share [Abstract]      
Weighted average shares outstanding - basic (in shares) 155,712,886 143,437,164 143,429,610
Dilutive equity awards (in shares) 65,873 133,342 5,311
Dilutive shares related to convertible notes (in shares) 14,275,217 24,589,370 0
Weighted average shares outstanding - dilutive (in shares) 170,053,975 168,159,876 143,434,921