Share Based Compensation, 401(k) Plan and Deferred Compensation - Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Option activity
Outstanding at beginning of year, shares	2,624,067
Exercised, shares	(111,209)
Forfeited/Expired, shares	(135,080)
Outstanding at end of year, shares	2,377,778	2,624,067
Vested/Exercisable at end of year, shares	2,377,778
Outstanding at beginning of year, Weighted Average Exercise Price	$ 15.47
Exercised, Weighted Average Exercise Price	11.56
Forfeited/Expired, Weighted Average Exercise Price	20.61
Outstanding at end of year, Weighted Average Exercise Price	15.36	$ 15.47
Vested/Exercisable at end of period, Weighted Average Exercise Price	$ 15.36
Weighted Average Remaining Contractual Term (in years)	2 years 1 month 24 days	3 years 1 month 13 days
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	2 years 1 month 24 days
Exercised, Aggregated Intrinsic Value	$ 347,881
Outstanding at end of year, Aggregate Intrinsic Value	8,003,403
Vested/Exercisable at end of year, Aggregate Intrinsic Value	$ 8,003,403