Shareholders' Equity (Schedule of Restricted Stock And Cash Entitlements Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Restricted Stock Expense	$ 1,246	$ 1,407	$ 963
Cash Entitlement Expense	657	570	580
Tax Effect	(746)	(782)	(615)
Net of Tax	$ 1,157	$ 1,195	$ 928