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Net income (loss) per common share - Summary (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net income (loss) (numerator) $ 235,095 $ (9,491)
Weighted-average common shares outstanding (denominator):    
Basic (shares) 232,351 230,476
Diluted (shares) 233,458 230,476
Net income (loss) per common share:    
Basic (USD per share) $ 1.01 $ (0.04)
Diluted (USD per share) $ 1.01 $ (0.04)
Dilutive non-vested restricted stock awards    
Weighted-average common shares outstanding (denominator):    
Incremental common shares (shares) 1,107 0