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NET INCOME PER COMMON SHARE (Tables)
 9 Months Ended
Sep. 30, 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
September 30
  
Nine Months Ended
September 30
 
  
2015
  
2014
  
2015
  
2014
 
Basic net income per common share
        
Numerator for basic net income per common share:
        
Net income
 
$
21,067
  
$
32,391
  
$
79,968
  
$
107,346
 
Preferred stock dividends
  
(3,809
)
  
(3,529
)
  
(11,339
)
  
(10,216
)
Earnings participation of unvested equity awards
  
(28
)
  
(24
)
  
(95
)
  
(58
)
  
$
17,230
  
$
28,838
  
$
68,534
  
$
97,072
 
Denominator for basic net income per common share:
                
Weighted average common stock outstanding
  
95,814
   
95,793
   
95,814
   
95,779
 
Average unvested stock awards outstanding
  
(284
)
  
(388
)
  
(314
)
  
(395
)
   
95,530
   
95,405
   
95,500
   
95,384
 
  
$
0.18
  
$
0.30
  
$
0.72
  
$
1.02
 
Diluted net income per common share
                
Numerator for diluted net income per common share:
                
Numerator for basic net income per common share
 
$
17,230
  
$
28,838
  
$
68,534
  
$
97,072
 
Denominator for diluted net income per common share:
                
Denominator for basic net income per common share
  
95,530
   
95,405
   
95,500
   
95,384
 
Net effect of dilutive equity awards
  
191
   
272
   
195
   
230
 
   
95,721
   
95,677
   
95,695
   
95,614
 
  
$
0.18
  
$
0.30
  
$
0.72
  
$
1.02