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NET INCOME PER COMMON SHARE (Tables)
 3 Months Ended
Mar. 31, 2015
NET INCOME PER COMMON SHARE [Abstract]  
Components of Computation of Basic and Diluted Net Income Per Common Share
Components of the computation of basic and diluted net income per common share were as follows for the indicated periods (dollars in thousands, except per share amounts):

  
Quarter Ended March 31
 
  
2015
  
2014
 
Basic net income per common share
    
Numerator for basic net income per common share:
    
Net income
 
$
33,957
  
$
38,391
 
Preferred stock dividends
  
(3,742
)
  
(3,238
)
Earnings participation of unvested equity awards
  
(34
)
  
(24
)
  
$
30,181
  
$
35,129
 
Denominator for basic net income per common share:
        
Weighted average common stock outstanding
  
95,825
   
95,777
 
Average unvested stock awards outstanding
  
(356
)
  
(428
)
   
95,469
   
95,349
 
  
$
0.32
  
$
0.37
 
Diluted net income per common share
        
Numerator for diluted net income per common share:
        
Numerator for basic net income per common share
 
$
30,181
  
$
35,129
 
         
Denominator for diluted net income per common share:
        
Denominator for basic net income per common share
  
95,469
   
95,349
 
Net effect of dilutive equity awards
  
205
   
189
 
   
95,674
   
95,538
 
  
$
0.32
  
$
0.37