Goodwill and Other Intangible Assets Gross and Net Carrying Amounts of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 81,680	$ 81,680
Finite-Lived Intangible Assets, Accumulated Amortization	48,673	41,962
Finite-Lived Intangible Assets, Net	33,007	39,718
Advisory Contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	75,013	75,013
Finite-Lived Intangible Assets, Accumulated Amortization	44,046	37,676
Finite-Lived Intangible Assets, Net	30,967	37,337
Employment Contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	3,247	3,247
Finite-Lived Intangible Assets, Accumulated Amortization	3,247	3,247
Finite-Lived Intangible Assets, Net	0	0
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,040	2,040
Finite-Lived Intangible Assets, Accumulated Amortization	0	0
Finite-Lived Intangible Assets, Net	2,040	2,040
Servicing Contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,380	1,380
Finite-Lived Intangible Assets, Accumulated Amortization	1,380	1,039
Finite-Lived Intangible Assets, Net	$ 0	$ 341