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Per Common Share Amounts
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Per Common Share Amounts Per Common Share Amounts
The following table provides a reconciliation of the weighted average number of common shares used in the calculation of basic and diluted earnings per share (in thousands):
 Three Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
Weighted average common shares for basic earnings per share48,211 48,132 48,179 48,111 
Effect of dilutive securities: unvested share awards (1)
33 — — — 
Weighted average common shares for diluted earnings per share48,244 48,132 48,179 48,111 
(1)For the three months ended September 30, 2020 and the nine months ended September 30, 2021 and 2020, there were no dilutive common shares and certain unvested common shares were not included in the calculation of diluted earnings per share because to do so would have been antidilutive.