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Earnings Per Share
 12 Months Ended
Dec. 31, 2013
Earnings Per Share
Earnings Per Share

The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars in thousands, except per share data).
 
Year Ended December 31
 
2013
 
2012
 
2011
Numerator:
 
 
 
 
 
Net income
$
441,329

 
$
160,240

 
$
158,805

Denominator:
 

 
 

 
 

Weighted average basic common shares outstanding
96,579

 
96,384

 
99,281

Effect of dilutive securities:
 
 
 
 
 
Stock options, unvested restricted stock, and performance units
968

 
1,113

 
1,095

Diluted common shares outstanding
97,547

 
97,497

 
100,376

Basic income per common share
$
4.57

 
$
1.66

 
$
1.60

Diluted income per common share
$
4.52

 
$
1.64

 
$
1.58



All outstanding options to purchase shares at December 31, 2013, 2012, and 2011, were included in the computation of diluted common shares outstanding.