Goodwill and Intangibles Schedule of Goodwill by Segment (Details) (Annual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, Gross	$ 80,363	$ 78,046	$ 54,591
Goodwill	58,361	34,906
Goodwill, Acquired During Period	3,519	23,455
Goodwill, Other Changes	(1,202)
Goodwill impairment	0	0	(2,334)
Goodwill, Impaired, Accumulated Impairment Loss	19,685	19,685	19,685
Goodwill	60,678	58,361	34,906
Alternative Investment
Goodwill [Roll Forward]
Goodwill, Gross	29,026	30,228	30,228
Goodwill	20,028	20,028
Goodwill, Acquired During Period	0	0
Goodwill, Other Changes	(1,202)
Goodwill impairment	0	0
Goodwill, Impaired, Accumulated Impairment Loss	10,200	10,200	10,200
Goodwill	18,826	20,028	20,028
Broker-Dealer
Goodwill [Roll Forward]
Goodwill, Gross	51,337	47,818	24,363
Goodwill	38,333	14,878
Goodwill, Acquired During Period	3,519	23,455
Goodwill, Other Changes	0
Goodwill impairment	0	0
Goodwill, Impaired, Accumulated Impairment Loss	9,485	9,485	9,485
Goodwill	41,852	$ 38,333	$ 14,878
CRT business | Broker-Dealer
Goodwill [Roll Forward]
Goodwill, Acquired During Period	3,500
Alternative Solutions [Member] | Alternative Investment
Goodwill [Roll Forward]
Goodwill, Other Changes	$ 1,200