Basis of Presentation (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($) shares	Jun. 30, 2018 USD ($) shares
Nature Of Business And Significant Accounting Policies [Abstract]
Unrecognized Share Based Compensation	$ 11	$ 11
Number of Years To Recognize Remaining Expense		2 years
Options excluded from the computations of diluted weighted-average shares outstanding | shares	7,318	7,474
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