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NET INCOME PER COMMON SHARE (Tables)
 3 Months Ended
Mar. 31, 2016
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
 
  
2016
  
2015
 
Basic net income per common share
      
Numerator for basic net income per common share:
      
Net income
 
$
27,353
  
$
33,957
 
Preferred stock dividends
  
(3,826
)
  
(3,742
)
Earnings participation of unvested equity awards
  
(44
)
  
(34
)
  
$
23,483
  
$
30,181
 
Denominator for basic net income per common share:
        
Average number of shares of common stock outstanding
  
95,913
   
95,825
 
Average unvested stock awards outstanding
  
(299
)
  
(356
)
   
95,614
   
95,469
 
  
$
0.25
  
$
0.32
 
Diluted net income per common share
        
Numerator for diluted net income per common share:
        
Numerator for basic net income per common share
 
$
23,483
  
$
30,181
 
         
Denominator for diluted net income per common share:
        
Denominator for basic net income per common share
  
95,614
   
95,469
 
Net effect of dilutive equity awards
  
131
   
205
 
   
95,745
   
95,674
 
  
$
0.25
  
$
0.32