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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Stock-Based Compensation [Abstract]  
Weighted average assumptions used to determine fair value for stock awards
      The fair value for stock awards was estimated at the date of grant using the Black-Scholes option valuation model with the following weighted average assumptions for the years ended December 31, 2013, 2012 and 2011:

 
2013
 
2012
 
2011
Expected life (years)                                                                      
 
6.9
 
 
 
6.9
 
 
 
6.3
 
Interest rate                                                                      
 
1.22
%
 
 
1.36
%
 
 
2.46
%
Volatility                                                                      
 
37.82
%
 
 
31.26
%
 
 
30.93
%
Expected dividend yield                                                                      
 
0.48
%
 
 
0.31
%
 
 
0.31
%
Summary of stock option activity
 The following table summarizes stock option activity for the year ended December 31, 2013:

 
 
Shares
 
 
 
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Life (Years)
 
 
Aggregate Intrinsic      Value                 (in thousands)
Balance December 31, 2012  
 
1,395,520
 
 
 
$
28.31
 
 
 
 
 
Granted  
 
239,770
 
 
 
 
41.42
 
 
 
 
 
Exercised  
 
(501,222
)
 
 
 
25.26
 
 
 
 
 
Canceled  
 
(2,653
)
 
 
 
37.24
 
 
 
 
 
Balance December 31, 2013  
 
1,131,415
 
 
 
$
32.42
 
6.16
 
$
31,283
 
 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, December 31, 2013  
 
758,014
 
 
 
$
29.67
 
4.95
 
$
23,046
Non-vested stock option activity
     Non-vested stock option activity for the year ended December 31, 2013 is as follows:

 
 
Shares
 
 
Weighted Average Exercise Price Per Share
 
Non-vested options outstanding at December 31, 2012
 
327,086
 
$
31.17
 
Options granted                                                                                                  
 
239,770
 
 
41.42
 
Options vested                                                                                                  
 
(190,802
)
 
30.57
 
Options forfeited …
 
(2,653
)
 
37.24
 
Non-vested options outstanding at December 31, 2013  
 
373,401
 
$
38.01
 
Summary of outstanding options by exercise price
The following table summarizes additional information concerning options outstanding at December 31, 2013:

Options Outstanding
 
Options Exercisable
Range of
 Exercise Prices
 
Number Outstanding at 12/31/13
 
Weighted Average Remaining Contractual Term (Years)
 
Weighted Average Exercise Price
 
Number Exercisable
at 12/31/13
 
Weighted Average Exercise Price
$
19.855
-
$
24.753
 
140,018
 
6.1
 
$
23.13
 
140,018
 
$
23.13
$
26.257
-
$
29.665
 
50,828
 
2.0
 
$
27.15
 
48,322
 
$
27.16
$
30.097
-
$
42.415
 
940,569
 
6.4
 
$
34.09
 
569,674
 
$
31.49
$
19.855
-
$
42.415
 
1,131,415
 
4.8
 
$
32.42
 
758,014
 
$
29.67
Summary of restricted stock activity
 The following table summarizes the restricted stock activity for the Plan:

 
 
 
 
Shares
 
 
 
Weighted Average Grant Date Fair Value
 
Unvested balance at December 31, 2012  
 
 
 
183,660
 
 
$
31.25
 
Granted  
 
 
 
112,225
 
 
$
41.44
 
Vested  
 
 
 
(107,956
)
 
$
30.71
 
Canceled  
 
 
 
(2,357
)
 
$
36.39
 
Unvested balance at December 31, 2013  
 
 
 
185,572
 
 
$
37.65