Variable Interest Entities (Summary Of Consolidated Variable Interest Entities) (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) item	Dec. 31, 2020 USD ($) item
Variable Interest Entity [Line Items]
Assets	$ 3,881,773	$ 3,961,400
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Assets	211,869	225,719
Maximum Risk of Loss	$ 29,784	$ 29,784
Number of VIE real estate joint ventures guaranteed by company | item	1	1
Asset Pledged as Collateral [Member] | Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Assets	$ 40,687	$ 41,798