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Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016:
 
Shares
 
Weighted-Average
Grant Date Price
per Share
Outstanding Restricted Stock as of December 31, 2015
329,356

 
$
108.46

Grants issued
36,600

 
183.04

Grants vested
(113,433
)
 
82.94

Grants forfeited
(1,600
)
 
128.71

Total Outstanding Restricted Stock as of June 30, 2016
250,923

 
$
130.74
Expense Recognition of Deferred Compensation
The recognition of compensation expense related to deferred compensation over the remaining vesting periods, adjusted for estimated forfeitures, is as follows:
Six Months 
 Remaining In
 
 
 
 
 
 
 
 
 
 
 
 
2016
 
2017
 
2018
 
2019
 
2020
 
Thereafter
 
Total
$
3,662,157

 
$
6,628,713

 
$
4,772,771

 
$
3,876,251

 
$
2,159,040

 
$
1,453,951

 
$
22,552,883
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 six months ended June 30, 2016 and 2015:
 
Shares Issued
 
Grant Date Value
June 30, 2016
21,940

 
$
3,879,431

June 30, 2015
27,192

 
3,826,458