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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-Based Compensation [Abstract]  
Summary of transaction involving stock options
The following table summarizes the transactions involving the stock option plans:
 
 
 
  
Weighted-
  
Weighted-
  
 
 
 
  
Average
  
Average
  
Aggregate
 
 
 
  
Exercise
  
Remaining
  
Intrinsic
 
(in thousands except exercise price and life)
 
Options
  
Price
  
Life (Years)
  
Value
 
 
  
  
  
 
Outstanding at December 31, 2010
  
328
  
$
22.06
   
3.9
  
$
4,807
 
Exercised
  
(121
)
  
21.55
         
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
 
Exercisable at December 31, 2013
  
93
  
$
23.04
   
2.2
  
$
2,374
 
 
Summary of information concerning outstanding and exercisable stock options
The following table summarizes information concerning outstanding and exercisable stock options at December 31, 2013:
 
 
 
Range of Exercise Price
 
(in thousands except life and exercise price)
 $
18.57-22.99
  $
23.00-26.11
  $
26.12-30.07
 
Options outstanding
  
36
   
37
   
20
 
Weighted-average remaining contractual life, in years
  
1.6
   
1.7
   
3.8
 
Weighted-average exercise price
 
$
19.62
  
$
23.50
  
$
28.16
 
Options exercisable
  
36
   
37
   
20
 
Weighted-average exercise price
 
$
19.62
  
$
23.50
  
$
28.16
 
 
Summary of nonvested stock and performance unit activity
The following table summarizes the nonvested stock and performance stock units activity:
 
 
 
  
Grant Date
  
 
 
 
  
Weighted-
  
Aggregate
 
 
 
  
Average
  
Intrinsic
 
(in thousands except fair value)
 
Shares
  
Fair Value
  
Value
 
Outstanding at December 31, 2010
  
363
  
$
29.20
  
$
13,340
 
Granted
  
270
   
35.48
     
Vested
  
(175
)
  
34.04
     
Cancelled
  
(58
)
  
28.45
     
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