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Earnings per share (Details) - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Weighted average common shares outstanding - basic 201,345 200,522 201,028 200,481
Effect of dilutive performance share awards and restricted stock units 348 17 300 16
Weighted average common shares outstanding - diluted 201,693 200,539 201,328 200,497
Shares excluded from the calculation of diluted earnings per share 0 187 0 191
Dividends declared per common share $ 0.2125 $ 0.2075 $ 0.4250 $ 0.4150