Shareholders' Equity - Restricted Stock (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	107,719	81,184
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ 651,700	$ 2,367,500
weighted average estimated fair value of restricted stock	$ 6.05	$ 29.16