(VIEs Not Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Receivables from managed entities and related parties, net	$ 29,929	$ 30,618
Variable Interest Entity, Not Primary Beneficiary [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Maximum Exposure to Loss in Non-consolidated VIEs	3,382
Variable Interest Entity, Not Primary Beneficiary [Member] | RRE Opportunity REIT [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Maximum Exposure to Loss in Non-consolidated VIEs	2,242
Variable Interest Entity, Not Primary Beneficiary [Member] | Trapeza Entities [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Maximum Exposure to Loss in Non-consolidated VIEs	956
Variable Interest Entity, Not Primary Beneficiary [Member] | Ischus Entities [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Maximum Exposure to Loss in Non-consolidated VIEs	184
Receivables from Managed Entities and Related Parties [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Receivables from managed entities and related parties, net	184
Receivables from Managed Entities and Related Parties [Member] | RRE Opportunity REIT [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Receivables from managed entities and related parties, net	0
Receivables from Managed Entities and Related Parties [Member] | Trapeza Entities [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Receivables from managed entities and related parties, net	0
Receivables from Managed Entities and Related Parties [Member] | Ischus Entities [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Receivables from managed entities and related parties, net	184
Investments [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Investments	3,198
Investments [Member] | RRE Opportunity REIT [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Investments	2,242
Investments [Member] | Trapeza Entities [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Investments	956
Investments [Member] | Ischus Entities [Member]
Carrying amounts of assets of nonconsolidated VIEs and maximum exposure to loss associated with these VIEs [Abstract]
Investments	$ 0