Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ (2,097)	$ 3,104
Change in net deferred tax assets	(150)	172
Prepaid and other assets	(1,957)	(2,309)
Net cash provided by operating activities	$ (3,841)	2,452
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		3,069
Change in net deferred tax assets		157
Prepaid and other assets		(2,259)
Net cash provided by operating activities		2,452
Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		35
Change in net deferred tax assets		15
Prepaid and other assets		$ (50)