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Income Taxes - Summary of Consolidated Federal Income Tax Return (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of consolidated Federal income tax return      
Current city income tax provision $ 952,957 $ 406,814 $ 658,106
Current state income tax provision 268,920 122,704 271,776
Current federal income tax provision 17,866,911 8,990,777 8,921,527
Deferred federal income tax benefit (5,611,451) (368,572) (1,209,928)
Provision for income taxes $ 13,477,337 $ 9,151,723 $ 8,641,481