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Per Common Share Amounts | 3 Months Ended
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Mar. 31, 2015
Per Common Share Amounts |
Per Common Share Amounts | Note 12. Weighted Average Per Common Share Amounts We calculate basic earnings per common share by dividing net income by the weighted average number of common shares outstanding during the period. We calculate diluted earnings per common share by using the more dilutive of the two class method or the treasury stock method. Unvested share awards and other potentially dilutive common shares, including contingently issuable common shares under our business management agreement with RMR, if any, and the related impact on earnings, are considered when calculating diluted earnings per share. 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 March 31,
|  | 2015 |  | 2014
Weighted average common shares for basic earnings per share |  |  | 221,375 |  |  | 188,026
Effect of dilutive securities: unvested share awards |  |  | 22 |  |  | 19
Weighted average common shares for diluted earnings per share |  |  | 221,397 |  |  | 188,045

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