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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2011  
 
1,898,578
 
 
 
1,640,060
 
 
 
27.05
 
 
 
300,540
 
 
 
23.60
 
Granted  
 
(381,624
)
 
 
244,646
 
 
 
32.06
 
 
 
136,978
 
 
 
32.08
 
Exercised/vested  
 
--
 
 
 
(241,196
)
 
 
25.01
 
 
 
(94,246
)
 
 
31.99
 
Canceled  
 
160,784
 
 
 
(69,536
)
 
 
26.80
 
 
 
(91,248
)
 
 
30.22
 
Balance December 31, 2011  
 
1,677,738
 
 
 
1,573,974
 
 
 
27.10
 
 
 
252,024
 
 
 
27.21
 
Granted  
 
(345,696
)
 
 
222,250
 
 
 
32.04
 
 
 
123,446
 
 
 
32.04
 
Exercised/vested
 
--
 
 
 
(330,158
)
 
 
25.15
 
 
 
(102,424
)
 
 
25.90
 
Canceled  
 
159,932
 
 
 
(70,546
)
 
 
27.76
 
 
 
(89,386
)
 
 
27.08
 
Balance December 31, 2012  
 
1,491,974
 
 
 
1,395,520
 
 
 
28.31
 
 
 
183,660
 
 
 
31.25
 
Granted
 
(351,995
)
 
 
239,770
 
 
 
41.42
 
 
 
112,225
 
 
 
41.44
 
Exercised/vested
 
--
 
 
 
(501,222
)
 
 
25.26
 
 
 
(107,956
)
 
 
30.71
 
Canceled  
 
5,010
 
 
 
(2,653
)
 
 
37.24
 
 
 
(2,357
)
 
 
36.39
 
Balance December 31, 2013  
 
1,144,989
 
 
 
1,131,415
 
 
 
32.42
 
 
 
185,572
 
 
 
37.65