Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Nature Of Business And Significant Accounting Policies [Abstract]
Unrecognized Share Based Compensation	$ 13
Number of Years To Recognize Remaining Expense	3 years
Options excluded from the computations of diluted weighted-average shares outstanding	7,635	2,892
Accounting Standards Update No. 2016-01 [Member]
Recently Adopted Accounting Pronouncement [Line Items]
Reclassification of net unrealized losses from accumulated other comprehensive gain (AOCI) to retained earnings	$ 7