Earnings per share

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Earnings Per Share

Earnings per share

The Company calculates earnings per share in accordance with Accounting Standards Codification (“ASC”) Topic 260. Basic earnings per share are computed by dividing reported earnings by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflect the additional dilution from all potentially dilutive securities, such as stock options and restricted stock units. For the three months ended March 31, 2013 and 2012, all outstanding options with an exercise price lower than the average market price for the period have been included in the calculation of diluted earnings per share.

The weighted-average number of shares of common stock and common stock equivalents used in the computation of basic and diluted earnings per share consisted of the following:

		Three Months Ended
		March 31,
		2013	2012
	(Amounts in Thousands)
Weighted-average number of shares outstanding - basic earnings per share		32,970	32,858
Dilutive effect of stock options and restricted stock units		2,057	1,367
Weighted-average number of shares outstanding - diluted earnings per share		35,027	34,225

For the three months ended March 31, 2013 and 2012, the potentially dilutive stock options excluded from the earnings per share computation, as their effect would be anti-dilutive, totaled 1.1 million and 2.7 million, respectively.