Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	$ 180,547	$ 177,287
Net income	(2,081)	3,082
Balance	$ 179,946	179,835
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance		176,910
Net income		3,047
Balance		179,423
Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance		377
Net income		35
Balance		$ 412