Goodwill and Other Intangible Assets Gross and Net Carrying Amounts of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 73,553	$ 81,680
Finite-Lived Intangible Assets, Accumulated Amortization	46,828	48,673
Finite-Lived Intangible Assets, Net	26,725	33,007
Advisory Contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	71,513	75,013
Finite-Lived Intangible Assets, Accumulated Amortization	46,828	44,046
Finite-Lived Intangible Assets, Net	24,685	30,967
Employment Contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	0	3,247
Finite-Lived Intangible Assets, Accumulated Amortization	0	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	0	1,380
Finite-Lived Intangible Assets, Accumulated Amortization	0	1,380
Finite-Lived Intangible Assets, Net	$ 0	$ 0