11. Earnings Per Share

Basic earnings per share represents net income for the period common shares were outstanding, divided by the weighted average number of common shares outstanding for the period. Diluted earnings per share represents net income divided by the weighted average number of common shares outstanding, inclusive of the effect of dilutive securities such as outstanding stock options, SARs, stock units and warrants.

The following are the common share amounts used to compute the basic and diluted earnings per share for each period:

There were an aggregate of 2.0 million and 4.2 million of equity grants that were outstanding during the three months ended March 31, 2014 and 2013, respectively, consisting of stock options, SARs, and stock units, but were not included in the computation of diluted earnings per share because their effect would be anti-dilutive or the market condition for the award has not been satisfied.

Since the Company will settle the principal amount of its Convertible Notes in cash and settle the conversion feature for the amount above the conversion price in common shares, or the conversion spread, the Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted earnings per share, if applicable. The conversion spread will have a dilutive impact on diluted earnings per share when the average market price of the Company’s common shares for a given period exceeds the conversion price of $86.28 per share. For the three months ended March 31, 2014, the Convertible Notes have been excluded from the computation of diluted earnings per share as the effect would be anti-dilutive since the conversion price of the Convertible Notes exceeded the average market price of the Company’s common stock for the three months ended March 31, 2014. The initial conversion rate and conversion price is described further in Note 4, Long-Term Debt.

The Capped Call Transactions executed in connection with the issuance of the Company’s Convertible Notes are excluded from the calculation of diluted earnings per share because their impact is always anti-dilutive.