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Share Based Compensation, 401(k) Plan and Deferred Compensation - Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Option activity    
Outstanding at beginning of year, shares 2,377,778  
Exercised, shares (128,330)  
Forfeited/Expired, shares (10,858)  
Outstanding at end of year, shares 2,238,590 2,377,778
Vested/Exercisable at end of year, shares 2,238,590  
Outstanding at beginning of year, Weighted Average Exercise Price $ 15.36  
Exercised, Weighted Average Exercise Price 9.59  
Forfeited/Expired, Weighted Average Exercise Price 20.61  
Outstanding at end of year, Weighted Average Exercise Price 15.67 $ 15.36
Vested/Exercisable at end of period, Weighted Average Exercise Price $ 15.67  
Weighted Average Remaining Contractual Term (in years) 1 year 1 month 6 days 2 years 1 month 24 days
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term (in years) 1 year 1 month 6 days  
Exercised, Aggregated Intrinsic Value $ 919,582  
Outstanding at end of year, Aggregate Intrinsic Value 8,735,293  
Vested/Exercisable at end of year, Aggregate Intrinsic Value $ 8,735,293