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Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding
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