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Earnings Per Share
 9 Months Ended
Sep. 30, 2013
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, 2013, and 2012. 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)  2013  2012  2013  2012
Net income $23,726 $19,314 $43,670 $38,492
              
Denominator for basic earnings per share -            
 weighted-average number of common            
 shares outstanding during the period  54,087  55,814  54,361  56,750
Incremental common shares attributable to            
 outstanding dilutive options  360  131  284  155
Incremental common shares attributable            
 to outstanding restricted shares,            
 restricted stock units and phantom stock  164  83  223  149
Denominator for diluted earnings per share  54,611  56,028  54,868  57,054
              
Basic earnings per share $0.44 $0.35 $0.80 $0.68
Diluted earnings per share $0.43 $0.34 $0.80 $0.67

Options to purchase 2.0 million and 2.3 million common shares for the three and nine months ended September 30, 2013, respectively, were not included in the computation of diluted earnings per share because their effect would have been anti-dilutive. Options to purchase 3.8 million and 3.7 million common shares for the three and nine months ended September 30, 2012, respectively, were not included in the computation of diluted earnings per share because their effect would have been anti-dilutive.