Senior And Subordinated Debt (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Apr. 29, 2010
Senior revolving credit facility over next 3 years				$ 150,000
Subordinated debt		150,000	150,000
Subordinated debt conversion, shares issuable, maximum		2,631,570
Convertible subordinated debt per share amounts		$ 57
Subordinated note maturity date		Sep. 30, 2016
Subordinated borrowing, annual interest rate		3.25%
Fair value of senior and subordinated debt	1,174,000	1,271,000
Fair value of senior and subordinated debt in excess of the aggregate carrying value	97,000	44,000
Unused line of credit facility available	322,000
Cost of repurchased subordinated note	131,829
Pre-tax gain resulted from repurchasing of subordinated note	18,171
Repurchasing date of subordinated note	July 22, 2011
Revolving Credit Facility [Member]
Revolver Credit Facility annual interest rate	1.90%
LFB [Member]
Unused line of credit facility available	100,000
Edgewater [Member]
Unused line of credit facility available	$ 65,000