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Compensation Plans - Schedule of Grants Issued and Grant Date Fair Value (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Issuance of stock grants $ 3,892,424 $ 3,879,431 $ 3,826,458
Common Stock      
Shares Issued 19,219 21,940 27,192
Issuance of stock grants $ 3,892,424 $ 3,879,431 $ 3,826,458