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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2022
Earnings Per Share [Abstract]  
Weighted average common shares outstanding A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculations follows:
Three Months EndedSix Months Ended
June 30,June 30,
2022202120222021
(In thousands, except per share amounts)
Weighted average common shares outstanding - basic203,351 201,345 203,351 201,028 
Effect of dilutive performance share awards and restricted stock units50 348 45 300 
Weighted average common shares outstanding - diluted203,401 201,693 203,396 201,328 
Shares excluded from the calculation of diluted earnings per share
52 — 175 — 
Dividends declared per common share
$.2175 $.2125 $.4350 $.4250