Segment Reporting (Narrative) (Details) (Investment Management, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Investment Management
Intercompany preferred dividend income received	$ 619	$ 619	$ 1,900	$ 1,200
Intercompany fees for serving as collateral manager and servicing activity	$ 1,000	$ 211	$ 1,400	$ 632