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Earnings per Common Share (Tables)
 12 Months Ended
Dec. 31, 2013
Earnings per Common Share [Abstract]  
Reconciliation of earnings per share data
A reconciliation of the earnings per share data from a basic to a fully diluted basis is detailed below (amounts in thousands, except per share data):

 
 
2013
  
2012
  
2011
 
Net income
 
$
52,362
  
$
35,378
  
$
43,013
 
Net income per share:
            
Basic
 
$
0.54
  
$
0.37
  
$
0.45
 
Diluted
 
$
0.46
  
$
0.32
  
$
0.41
 
 
            
Shares used in computing net income per share:
            
Weighted average basic shares outstanding
  
96,181
   
95,189
   
94,549
 
Dilutive securities:
            
Stock options and unvested RSAs
  
4,516
   
4,289
   
3,281
 
Stock warrants
  
6,702
   
6,564
   
6,082
 
Shares issuable on conversion of the Notes
  
6,499
   
4,468
   
—
 
Total dilutive securities
  
17,717
   
15,321
   
9,363
 
 
            
Weighted average diluted shares outstanding
  
113,898
   
110,510
   
103,912