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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2011
Stockholders' Equity [Abstract]  
Stock option and restricted stock activity
  The following table summarizes stock option and restricted stock activity for the Plan:

         
Stock Options
 
Restricted Stock
   
Shares Available for Grant
     
Shares
     
Weighted Average Exercise Price Per Share ($)
     
Shares
     
Weighted Average Exercise Price Per Share ($)
 
Balance  January 1, 2009
 
435,850
     
661,781
   
$
55.14
     
161,294
   
$
61.63
 
Granted
 
(280,600
)
   
179,200
     
39.84
     
101,400
     
39.65
 
Authorized ...........
 
800,000
     
--
     
--
     
--
     
--
 
Exercised/vested
 
--
     
(7,532
)
   
35.63
     
(41,020
)
   
60.35
 
Canceled
 
78,875
     
(45,919
)
   
43.14
     
(32,956
)
   
61.30
 
Balance December 31, 2009
 
1,034,125
     
787,530
   
$
52.54
     
188,718
   
$
50.16
 
Granted
 
(219,460
)
   
141,140
     
49.12
     
78,320
     
49.13
 
Exercised/vested..........
 
--
     
(31,697
)
   
44.88
     
(59,087
)
   
54.43
 
Canceled
 
134,624
     
(76,943
)
   
54.42
     
(57,681
)
   
52.12
 
Balance December 31, 2010 
 
949,289
     
820,030
   
$
54.21
     
150,270
   
$
47.19
 
Granted............
 
(190,812
)
   
122,323
     
64.12
     
68,489
     
64.17
 
Exercised/vested..........
 
--
     
(120,598
)
   
50.02
     
(47,123
)
   
63.98
 
Canceled
 
80,392
     
(34,768
)
   
53.59
     
(45,624
)
   
60.44
 
Balance December 31, 2011
 
838,869
     
786,987
   
$
54.19
     
126,012
   
$
54.52