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Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2014
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 and related activity during the six months ended June 30, 2014 and the year ended December 31, 2013:
 
 
Shares
 
Weighted-Average
Grant Date Price
per Share
Outstanding Restricted Stock 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

Outstanding Restricted Stock as of December 31, 2013
312,099

 
$
74.17

Grants issued
32,913

 
119.59

Grants vested
(10,087
)
 
56.27

Grants forfeited
(6,313
)
 
78.24

Total outstanding Restricted Stock as of June 30, 2014
328,612

 
$
79.55
Expense Recognition of Deferred Compensation
Compensation expense recognition of deferred equity compensation over the remaining service periods is as follows:
 
Six Months 
 Remaining In
 
 
 
 
 
 
 
 
 
 
 
 
2014
 
2015
 
2016
 
2017
 
2018
 
2019
 
Total
$
2,900,620

 
$
4,771,915

 
$
2,082,773

 
$
1,474,020

 
$
741,983

 
$
149,871

 
$
12,121,182
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block]
The following table represents stock grant transactions during the six months ended June 30, 2014 and 2013:
 
Shares Issued
 
Grant Date Value
June 30, 2014
33,745

 
$
3,984,817

June 30, 2013
59,006

 
4,606,008
Summary of Company's Expenses Attributable to 401(k) Plan
The following table summarizes the Company’s expenses attributable to the plan during the three and six months ended June 30, 2014 and 2013:
 
 
June 30,
2014
 
June 30,
2013
Three Months Ended
$
334,259

 
$
284,569

Six Months Ended
658,003

 
564,782