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Earnings Per Share
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Earnings Per Share

Note 3 – Earnings Per Share

Basic earnings per share is computed using the weighted-average number of shares outstanding. Diluted earnings per share is computed using the weighted-average number of shares outstanding adjusted for the incremental shares attributed to outstanding stock equivalents during the three and nine months ended September 30, 2014 and 2013. Stock equivalents include common shares issuable upon the exercise of stock options and other equity instruments, and are computed using the treasury stock method. Under the treasury stock method, the exercise price of a share, the amount of compensation cost, if any, for future service that the Company has not yet recognized, and the amount of estimated tax benefits that would be recorded in paid-in-capital, if any, when the share is exercised are assumed to be used to repurchase shares in the current period.

The following table sets forth the calculation of basic and diluted earnings per share.
              
   Three Months Ended Nine Months Ended
   September 30, September 30,
(in thousands, except per share data)  2014  2013  2014  2013
Net income $17,156 $23,726 $58,431 $43,670
              
Denominator for basic earnings per share -            
 weighted-average number of common            
 shares outstanding during the period  53,660  54,087  53,712  54,361
Incremental common shares attributable to            
 exercise of outstanding dilutive options  445  360  460  284
Incremental common shares attributable            
 to outstanding restricted shares and            
 restricted stock units  160  164  215  223
Denominator for diluted earnings per share  54,265  54,611  54,387  54,868
              
Basic earnings per share $0.32 $0.44 $1.09 $0.80
Diluted earnings per share $0.32 $0.43 $1.07 $0.80

Options to purchase 0.8 million and 0.7 million common shares for the three and nine months ended September 30, 2014, respectively, were not included in the computation of diluted earnings per share because their effect would have been anti-dilutive. Options to purchase 2.0 million and 2.3 million common shares for the three and nine month periods September 30, 2013, respectively, were not included in the computation of diluted earnings per share because their effect would have been anti-dilutive.