Other Receivables, Other Assets, Accounts Payable And Other Liabilities (Schedule Of Other Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Receivables, Other Assets, Accounts Payable And Other Liabilities [Abstract]
Cash collateral due from counterparties	$ 4,838	$ 41,172
Asset management fees receivable	886	1,159
Accrued interest and dividend receivable	10,521	3,549
Revenue share receivable	115	150
Other receivables	647	595
Other receivables	$ 17,007	$ 46,625