Investments (Summary Of Investment In The Private Equity Funds) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Total Private Equity Funds	$ 25,151	$ 19,090
ECP II [Member]
Schedule of Equity Method Investments [Line Items]
Total Private Equity Funds	5,037	4,856
Discovery Fund [Member]
Schedule of Equity Method Investments [Line Items]
Total Private Equity Funds	2,393	2,734
EMCP II [Member]
Schedule of Equity Method Investments [Line Items]
Total Private Equity Funds	9,674	7,580
CSI Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Private Equity Funds	3,496	3,361
Trilantic IV [Member]
Schedule of Equity Method Investments [Line Items]
Total Private Equity Funds	$ 4,551	$ 559