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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2014
SHARE-BASED COMPENSATION [Abstract]  
Summary of transaction involving stock options
The following table summarizes the transactions involving the Company’s stock option plans:
 
(in thousands except exercise price and life)
 
Options
  
Weighted Average Exercise Price
  
Weighted Average Remaining Life (Years)
  
Aggregate Intrinsic Value
 
Outstanding at December 31, 2011
  
207
  
$
22.36
   
3.1
  
$
3,222
 
Exercised
  
(66
)
  
22.38
         
Outstanding at December 31, 2012
  
141
   
22.35
   
2.7
   
1,859
 
Exercised
  
(48
)
  
21.00
         
Outstanding at December 31, 2013
  
93
   
23.04
   
2.2
   
2,374
 
Exercised
  
(27
)
  
21.92
         
Outstanding at December 31, 2014
  
66
  
$
23.49
   
1.7
  
$
2,438
 
Exercisable at December 31, 2014
  
66
  
$
23.49
   
1.7
  
$
2,438
 
Summary of information concerning outstanding and exercisable stock options
The following table summarizes information concerning outstanding and exercisable stock options at December 31, 2014:
 
  
Range of Exercise Price
 
(in thousands except life and exercise price)
 
$
18.57-23.08
  
$
23.09-26.11
  
$
26.12-30.07
 
Options outstanding
  
25
   
20
   
21
 
Weighted average remaining contractual life, in years
  
1.1
   
1.3
   
2.8
 
Weighted average exercise price
 
$
19.34
  
$
23.86
  
$
28.16
 
Options exercisable
  
25
   
20
   
21
 
Weighted average exercise price
 
$
19.34
  
$
23.86
  
$
28.16
 
Summary of nonvested stock and performance unit activity
The following table summarizes the non-vested stock and performance stock unit activity:

(in thousands except fair value)
 
Shares
  
Grant Date Weighted Average Fair Value
  
Aggregate Intrinsic Value
 
Outstanding at December 31, 2011
  
400
  
$
31.42
  
$
15,142
 
Granted
  
293
   
36.09
     
Vested
  
(314
)
  
33.59
     
Cancelled
  
(40
)
  
33.41
     
Outstanding at December 31, 2012
  
339
   
33.22
   
12,046
 
Granted
  
262
   
46.14
     
Vested
  
(94
)
  
40.57
     
Cancelled
  
(10
)
  
42.22
     
Outstanding at December 31, 2013
  
497
   
38.46
   
24,095
 
Granted
  
171
   
55.21
     
Vested
  
(40
)
  
27.15
     
Cancelled
  
(24
)
  
40.84
     
Outstanding at December 31, 2014
  
604
  
$
43.84
  
$
36,454