Financial Instruments (Schedule Of Other Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Other investments, Amortized Cost	$ 12,243	$ 14,315
Other investments, Carrying Value	10,057	14,864
Other investments, Unrealized Gain / (Loss)	(2,186)	549
Equity securities [Member]
Schedule of Investments [Line Items]
Other investments, Amortized Cost	6,905	8,598
Other investments, Carrying Value	5,457	9,352
Other investments, Unrealized Gain / (Loss)	(1,448)	754
U.S. Insurance JV [Member]
Schedule of Investments [Line Items]
Other investments, Amortized Cost	2,009	2,048
Other investments, Carrying Value	2,017	2,223
Other investments, Unrealized Gain / (Loss)	8	175
SPAC Funds [Member]
Schedule of Investments [Line Items]
Other investments, Amortized Cost	646	646
Other investments, Carrying Value	609	668
Other investments, Unrealized Gain / (Loss)	(37)	22
CLOs [Member]
Schedule of Investments [Line Items]
Other investments, Amortized Cost	2,557	2,894
Other investments, Carrying Value	1,877	2,522
Other investments, Unrealized Gain / (Loss)	(680)	(372)
Residential Loans [Member]
Schedule of Investments [Line Items]
Other investments, Amortized Cost	126	129
Other investments, Carrying Value	97	99
Other investments, Unrealized Gain / (Loss)	$ (29)	$ (30)