Basis Of Presentation (Narrative) (Details) - Accounting Standards Update 2016-09 [Member] - Impact Of Forfeitures On Compensation Cost [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to additional paid in capital	$ 379
Increase to deferred tax assets	141
Deferred Tax Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment	141
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment	(238)
Additional Paid In Capital [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment	$ 379