Fair Value Disclosures (Schedule Of Assets And Liabilities Measured With Level 3 Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Trading Securities [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance		$ 186
Accretion of income
Sales		$ (183)
Trading Securities [Member] | Trading Revenue [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Transactions included in income		(3)
Alternative Investments [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance	$ 25,246	24,078
Transfers into Level 3	0
Transfers out of Level 3	0
Accretion of income	2,333	1,577
Purchases		25,288
Sales	(9,601)	(25,852)
Level 3 inputs, Ending balance	14,105	25,246
Change in unrealized gains /(losses) for the period included in earnings	(1,676)	178
Alternative Investments [Member] | Principal Investing [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Transactions included in income	(3,873)	155
Other Investments, Equity Securities [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance	3,717
Sales	(1,203)
Level 3 inputs, Ending balance	2,502	3,717
Change in unrealized gains /(losses) for the period included in earnings	(12)
Other Investments, Equity Securities [Member] | Principal Investing [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Transactions included in income	(12)
Other Investments, Equity Securities [Member] | Alternative Investments [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance	3,717	$ 24,043
Accretion of income
Sales		$ (22,204)
Level 3 inputs, Ending balance		3,717
Change in unrealized gains /(losses) for the period included in earnings		1,800
Other Investments, Equity Securities [Member] | Alternative Investments [Member] | Principal Investing [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Transactions included in income		1,878
EuroDekania [Member] | Alternative Investments [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance	3,717	$ 4,192
Accretion of income
Sales	(1,203)	$ (2,275)
Level 3 inputs, Ending balance	2,502	3,717
Change in unrealized gains /(losses) for the period included in earnings	(12)	1,800
EuroDekania [Member] | Alternative Investments [Member] | Principal Investing [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Transactions included in income	(12)	1,800
Star Asia [Member] | Alternative Investments [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance		$ 17,104
Accretion of income
Sales		$ (17,182)
Star Asia [Member] | Alternative Investments [Member] | Principal Investing [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Transactions included in income		78
Star Asia Special Situations Fund [Member] | Alternative Investments [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance		$ 2,747
Accretion of income
Sales		$ (2,747)
CLO's [Member] | Alternative Investments [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance	21,518
Accretion of income	2,333	1,577
Purchases		25,288
Sales	(8,398)	(3,648)
Level 3 inputs, Ending balance	11,569	21,518
Change in unrealized gains /(losses) for the period included in earnings	(1,687)	(1,622)
CLO's [Member] | Alternative Investments [Member] | Principal Investing [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Transactions included in income	(3,884)	(1,699)
CDOs [Member] | Alternative Investments [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance	11	$ 35
Accretion of income
Level 3 inputs, Ending balance	34	$ 11
Change in unrealized gains /(losses) for the period included in earnings	23
CDOs [Member] | Alternative Investments [Member] | Principal Investing [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Transactions included in income	$ 23	(24)
CLO's [Member] | Trading Securities [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Level 3 inputs, Beginning balance		$ 186
Accretion of income
Sales		$ (183)
CLO's [Member] | Trading Securities [Member] | Trading Revenue [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs
Transactions included in income		$ (3)