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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2014
Income Tax Disclosure [Abstract]  
Summary of consolidated Federal income tax return
As part of the consolidated group, subsidiaries transfer to the Company their current federal tax liabilities or assets.
 
 
As of December 31,
 
2014
 
2013
 
2012
Current city income tax provision
$
935,612

 
$
952,957

 
$
406,814

Current state income tax provision
429,147

 
268,920

 
122,704

Current federal income tax provision
15,015,813

 
17,866,911

 
8,990,777

Deferred federal income tax expense (benefit)
2,404,433

 
(5,611,451
)
 
(368,572
)
Provision for income taxes
$
18,785,005

 
$
13,477,337

 
$
9,151,723

Summary of reconciliation of income tax expense
A reconciliation of income tax expense at the statutory federal rate to the Company’s income tax expense is as follows:
 
 
2014
 
2013
 
2012
Income tax computed at statutory rate
$
17,628,078

 
$
12,471,258

 
$
9,128,915

City and state income taxes, net of federal benefit
887,093

 
794,220

 
344,187

Other
269,834

 
211,859

 
(321,379
)
Income tax expense
$
18,785,005

 
$
13,477,337

 
$
9,151,723

Summary of Deferred tax assets and liabilities
Deferred tax assets and liabilities consist of the following at December 31, 2014 and 2013:
 
 
2014
 
2013
Stock-based compensation
$
5,433,419

 
$
4,433,293

Accrued incentive compensation
2,964,688

 
4,075,735

Unrealized gains
(2,436,006
)
 
(316,926
)
Other assets and liabilities
(303,109
)
 
(128,677
)
Net deferred tax assets
$
5,658,992

 
$
8,063,425