Shareholders' Equity- Stock Options Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Stock options exercised, Shares	5,500
Options Granted, Number of Shares	0
Options Forfeited or Expired, Number of Shares	0
Options Outstanding, Ending Balance	0
Option Exercisable, Number of Shares	0
Options Exercised, Weighted Average Exercise Price	$ 19.75
Compensation expense related to stock options	$ 0	$ 0	$ 0