Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Other Receivables	$ 1,902	$ 2,323
Other Investments, at fair value	21,528	35
Maximum Exposure to loss in non-consolidated VIEs	23,430	2,358
Managed Variable Interest Entity [Member]
Variable Interest Entity [Line Items]
Other Receivables	1,829	2,239
Maximum Exposure to loss in non-consolidated VIEs	1,829	2,239
Third-Party Managed Variable Interest Entity [Member]
Variable Interest Entity [Line Items]
Other Receivables	73	84
Other Investments, at fair value	21,528	35
Maximum Exposure to loss in non-consolidated VIEs	$ 21,601	$ 119