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Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments Schedule [Abstract]  
Summary of Investments
At September 30, 2018 and December 31, 2017, the Company's investments were as follows:
 
September 30, 2018
 
December 31, 2017
($ in thousands)
 
 
 
Marketable securities
$
62,330

 
$
66,424

Equity method investments
9,943

 
11,098

Nonqualified retirement plan assets
7,409

 
6,706

Investments in collateralized loan obligations
5,043

 
23,339

Other investments
406

 
925

Total investments
$
85,131

 
$
108,492
Schedule of Marketable Securities
The composition of the Company’s marketable securities is summarized as follows:
September 30, 2018
 
Cost
 
Unrealized
Loss
 
Unrealized
Gain
 
Fair
Value
($ in thousands)
 
 
 
 
 
 
 
Marketable securities:
 
 
 
 
 
 
 
Sponsored funds
$
39,568

 
$
(983
)
 
$
1,366

 
$
39,951

Equity securities
15,903

 
(9
)
 
2,747

 
18,641

Sponsored closed-end funds
3,787

 
(417
)
 
368

 
3,738

Total marketable securities
$
59,258

 
$
(1,409
)
 
$
4,481

 
$
62,330


December 31, 2017
 
Cost
 
Unrealized
Loss
 
Unrealized
Gain
 
Fair
Value
($ in thousands)
 
 
 
 
 
 
 
Marketable securities:
 
 
 
 
 
 
 
Sponsored funds
$
47,084

 
$
(1,294
)
 
$
1,059

 
$
46,849

Equity securities
13,141

 
(2
)
 
2,671

 
15,810

Sponsored closed-end funds
3,761

 
(302
)
 
306

 
3,765

Total marketable securities
$
63,986

 
$
(1,598
)
 
$
4,036

 
$
66,424