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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity [Abstract]  
Stock option and restricted stock activity
The following table summarizes stock option and restricted stock activity for the Plans:

   
Stock Options
  
Restricted Shares
 
  
Shares
Available for
 Grant
  
Shares
  
Weighted
Average
Exercise
Price Per
Share ($)
  
Shares
  
Weighted
Average
Exercise
Price Per
Share ($)
 
                
Balance January 1, 2015
  
996,127
   
951,079
  
$
37.46
   
175,488
  
$
50.56
 
Authorized
  
880,000
   
-
   
-
   
-
   
-
 
Granted
  
(455,275
)
  
238,773
   
60.40
   
216,502
   
60.32
 
Exercised/vested
  
-
   
(74,839
)
  
33.12
   
(59,801
)
  
47.51
 
Canceled
  
71,113
   
(23,169
)
  
60.22
   
(47,944
)
  
51.43
 
Balance December 31, 2015
  
1,491,965
   
1,091,844
   
42.29
   
284,245
   
58.63
 
Granted
  
(538,787
)
  
383,622
   
38.59
   
155,165
   
38.37
 
Exercised/vested
  
-
   
(150,944
)
  
36.66
   
(88,746
)
  
57.38
 
Canceled
  
249,248
   
(125,797
)
  
43.78
   
(123,451
)
  
50.72
 
Balance December 31, 2016
  
1,202,426
   
1,198,725
   
41.66
   
227,213
   
49.57
 
Granted
  
(257,072
)
  
187,533
   
77.99
   
69,539
   
78.00
 
Exercised/vested
  
-
   
(353,636
)
  
41.56
   
(61,274
)
  
52.51
 
Canceled
  
91,151
   
(35,783
)
  
50.47
   
(55,368
)
  
52.74
 
Balance December 31, 2017
  
1,036,505
   
996,839
   
48.21
   
180,110
   
58.57