Variable Interest Entities (Schedule Of Assets And Liabilities Of Variable Interest Entities) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Total assets	$ 3,967
Total liabilities	716
Cash and Cash Equivalents [Member]
Variable Interest Entity [Line Items]
Total assets	3,467
Other Receivables [Member]
Variable Interest Entity [Line Items]
Total assets	250
Other Assets [Member]
Variable Interest Entity [Line Items]
Total assets	250
Redeemable Financial Instruments [Member]
Variable Interest Entity [Line Items]
Total liabilities	$ 716