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Net Income Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Net Income Per Share
Net Income Per Share
Basic EPS is computed based on the weighted average number of common shares (including participating securities) issued and outstanding during the period. Diluted EPS is computed based on the weighted average number of common shares issued and outstanding plus equivalent shares, assuming the exercise of stock options. The dilutive effect of stock options is computed by application of the treasury-stock method. The following is a reconciliation between basic and diluted weighted average shares outstanding:
 
 
For the three months 
 ended March 31,
(in thousands, except per share data)
2015
 
2014
Net income
$
56,951

 
$
52,415

Net income attributable to unvested awarded performance stock
(1,363
)
 
(1,376
)
Net income attributable to common shares
$
55,588

 
$
51,039

Weighted average number of common shares outstanding – basic
142,777

 
145,429

Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic
(3,417
)
 
(3,819
)
Weighted average number of common shares outstanding for basic earnings per common share
139,360

 
141,610

Dilutive effect of stock options
2,127

 
1,699

Weighted average number of shares outstanding – diluted
141,487

 
143,309

Net income per share:
 
 
 
Basic
$
0.40

 
$
0.36

Diluted
$
0.39

 
$
0.36