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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments Schedule [Abstract]  
Summary of Investments
The Company’s investments, excluding the assets of consolidated sponsored investment products and the assets of the consolidated investment product discussed in Note 18, at December 31, 2016 and 2015 were as follows:
 
 
December 31,
 
2016
 
2015
($ in thousands)
 
 
 
Marketable securities
$
74,907

 
$
41,496

Equity method investments
7,731

 
9,007

Nonqualified retirement plan assets
5,808

 
5,310

Other investments
925

 
925

Total investments
$
89,371

 
$
56,738
Schedule of Marketable Securities
The composition of the Company’s marketable securities is summarized as follows:
 
December 31, 2016
 
Cost
 
Unrealized
Loss
 
Unrealized
Gain
 
Fair
Value
($ in thousands)
 
 
 
 
 
 
 
Trading:
 
 
 
 
 
 
 
Sponsored funds
$
61,784

 
$
(1,942
)
 
$
177

 
$
60,019

Equity securities
10,578

 
—

 
895

 
11,473

Available-for-sale:
 
 
 
 
 
 
 
Sponsored closed-end funds
3,500

 
(265
)
 
180

 
3,415

Total marketable securities
$
75,862

 
$
(2,207
)
 
$
1,252

 
$
74,907

 
December 31, 2015
 
Cost
 
Unrealized
Loss
 
Unrealized
Gain
 
Fair
Value
($ in thousands)
 
 
 
 
 
 
 
Trading:
 
 
 
 
 
 
 
Sponsored funds
$
31,167

 
$
(2,134
)
 
$
298

 
$
29,331

Equity securities
9,434

 
(386
)
 
120

 
9,168

Available-for-sale:
 
 
 
 
 
 
 
Sponsored closed-end funds
3,355

 
(365
)
 
7

 
2,997

Total marketable securities
$
43,956

 
$
(2,885
)
 
$
425

 
$
41,496