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Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Investments Schedule [Abstract]  
Summary of Investments
The Company’s investments, excluding the assets of consolidated investment products discussed in Note 18, at December 31, 2017 and 2016 were as follows: 
 
December 31,
 
2017
 
2016
($ in thousands)
 
 
 
Marketable securities
$
66,424

 
$
74,907

Equity method investments
11,098

 
7,731

Nonqualified retirement plan assets
6,706

 
5,808

Investments in collateralized loan obligations
23,339

 
—

Other investments
925

 
925

Total investments
$
108,492

 
$
89,371
Schedule of Marketable Securities
The composition of the Company’s marketable securities is summarized as follows: 
December 31, 2017
 
Cost
 
Unrealized
Loss
 
Unrealized
Gain
 
Fair
Value
($ in thousands)
 
 
 
 
 
 
 
Trading:
 
 
 
 
 
 
 
Sponsored funds
$
47,084

 
$
(1,294
)
 
$
1,059

 
$
46,849

Equity securities
13,141

 
(2
)
 
2,671

 
15,810

Available-for-sale:
 
 
 
 
 
 
 
Sponsored closed-end funds
3,761

 
(302
)
 
306

 
3,765

Total marketable securities
$
63,986

 
$
(1,598
)
 
$
4,036

 
$
66,424

 
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