Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Carrying Values Associated With Level 3 Financial Instruments) (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total	Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers, Out of Level 3	$ 0	$ (5,900)
Mortgage-backed Securities: Non-Agency [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	719	806
Unrealized gains/(losses), Included in changes in net assets	(23)	(83)
Realized gains/(losses)	19	33
Redemptions	(45)	(86)
Net change	(49)	(136)
Ending Balance	670	670
Corporate Fixed Income Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	2,680	1,993
Unrealized gains/(losses), Included in changes in net assets	210	210
Purchases	8,963	11,643
Sales	(7,281)	(9,274)
Net change	1,892	2,579
Ending Balance	4,572	4,572
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	619	1,144
Sales		(525)
Net change		(525)
Ending Balance	619	619
Asset-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	44,387	44,045
Unrealized gains/(losses), Included in OCI, Assets		342
Realized gains/(losses)	(2,136)	(2,136)
Sales	(42,251)	(42,251)
Net change	(44,387)	(44,045)
Corporate Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unrealized gains/(losses), Included in changes in net assets	85	85
Transfers, Into Level 3	2,877	2,877
Net change	2,962	2,962
Ending Balance	2,962	2,962
Equity Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	42,518	46,197
Unrealized gains/(losses), Included in changes in net assets	(788)	(242)
Purchases	6,625	6,625
Redemptions		(4,225)
Net change	5,837	2,158
Ending Balance	48,355	48,355
Municipal Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	1,330	1,326
Unrealized gains/(losses), Included in changes in net assets	(6)	(2)
Net change	(6)	(2)
Ending Balance	1,324	1,324
Other Investment [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	66,557	72,990
Unrealized gains/(losses), Included in changes in net assets	3,030	3,968
Realized gains/(losses)	126	(503)
Purchases	2,701	4,396
Sales	(266)	(2,740)
Redemptions	(29)	(84)
Transfers, Out of Level 3	(2,877)	(8,785)
Net change	2,685	(3,748)
Ending Balance	$ 69,242	$ 69,242