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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Roll-forward of outstanding restricted stock grants issued
The following table represents a roll-forward of outstanding restricted stock grants issued pursuant to the 2011 and 2005 Plans and related activity during the years ended December 31, 2013 and 2012:
 
 
Shares
 
Weighted-Average
Grant Date Price
per Share
Outstanding restricted stock grants as of December 31, 2011
260,621

 
$
73.78

Grants issued
107,600

 
75.64

Grants vested
(46,056
)
 
75.22

Grants forfeited
(2,177
)
 
71.37

Outstanding restricted stock grants as of December 31, 2012
319,988

 
$
74.22

Grants issued
32,000

 
85.63

Grants vested
(39,749
)
 
80.77

Grants forfeited
(140
)
 
77.81

Total outstanding restricted stock grants as of December 31, 2013
312,099

 
$
74.17
Expense recognition of deferred compensation
Compensation expense recognition of deferred compensation over the remaining vesting periods, adjusted for estimated forfeitures, is as follows:
 
2014
 
2015
 
2016
 
2017
 
2018
 
Total
$
4,647,324

 
$
3,588,155

 
$
1,641,218

 
$
1,024,797

 
$
261,197

 
$
11,162,691
Schedule of Grants Issued and Grant Date Fair Value
The following table represents stock grant transactions during the years ended December 31, 2013, 2012, and 2011:
 
Shares Issued
 
Grant Date Value
December 31, 2013
59,006

 
$
4,606,008

December 31, 2012
71,949

 
5,540,792

December 31, 2011
103,899

 
7,691,800
Summary of company expenses attributable to the 401(k) Plan
The following table summarizes the Company’s expenses attributable to the plan during the years ended December 31, 2013, 2012 and 2011:
 
2013
 
2012
 
2011
$
1,171,154

 
$
1,044,255

 
$
960,888