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Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2015
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 nine months ended September 30, 2015:
 
Shares
 
Weighted-Average
Grant Date Price
per Share
Outstanding Restricted Stock as of December 31, 2014
335,768

 
$
79.79

Grants issued
74,650

 
167.56

Grants vested
(77,462
)
 
73.16

Grants forfeited
(3,500
)
 
77.81

Total Outstanding Restricted Stock as of September 30, 2015
329,456

 
$
105.92
Expense Recognition of Deferred Compensation
Compensation expense recognition of deferred compensation over the remaining vesting periods, adjusted for estimated forfeitures, is as follows:
Three Months 
 Remaining In
 
 
 
 
 
 
 
 
 
 
 
 
2015
 
2016
 
2017
 
2018
 
2019
 
Thereafter
 
Total
$
1,884,289

 
$
4,895,605

 
$
4,367,334

 
$
3,664,240

 
$
2,759,522

 
$
2,140,850

 
$
19,711,840
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 issued as part of our incentive compensation program during the nine months ended September 30, 2015 and 2014:
 
Shares Issued
 
Grant Date Value
September 30, 2015
27,192

 
$
3,826,458

September 30, 2014
33,745

 
3,984,817