Earnings per Share

6 Months Ended

Jun. 30, 2011

Earnings per Share

Earnings per Share

(4) Earnings per Share

The following table shows the information used in the calculation of our share counts for basic and diluted earnings per share:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2010		2011		2010		2011
Weighted average common shares outstanding for basic calculation		120,340,272		145,165,549		120,395,405		145,010,867
Add: Effect of stock options and restricted stock		748,148		798,855		687,099		712,178
Weighted average common shares outstanding for diluted calculation		121,088,420		145,964,404		121,082,504		145,723,045

Basic earnings per common share are calculated by dividing net income by the weighted average number of common shares outstanding. Diluted earnings per share are calculated by dividing net income by the sum of the weighted average number of common shares outstanding plus the additional common shares that would have been outstanding if potentially dilutive securities had been issued.

The weighted average common shares outstanding for the diluted calculation excludes consideration of stock options covering 227,000 shares and 2,600 shares in the three months ended June 30, 2010 and 2011, respectively, and 232,000 shares and 2,600 shares in the six months ended June 30, 2010 and 2011, respectively, because the exercise prices were greater than the weighted average market price of our common stock for each of those periods.