Composition Of Certain Financial Statement Captions (Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 63,996	$ 48,112
Accrued employee benefits and other personnel	7,299	5,408
Accrued consulting, outsourcing and professional fees	16,676	17,477
Accrued brokerage fees	5,733	8,665
Accrued sub-advisory, distribution and other asset management fees	17,548	17,091
Accrued dividend payable	0	26,518
Other accrued liabilities	27,053	23,773
Total accrued liabilities	$ 138,305	$ 147,044