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Investments (Tables)
 9 Months Ended
Sep. 30, 2017
Investments Schedule [Abstract]  
Summary of Investments
At September 30, 2017 and December 31, 2016, the Company's investments were as follows:
 
September 30, 2017
 
December 31, 2016
($ in thousands)
 
 
 
Marketable securities
$
75,702

 
$
74,907

Equity method investments
10,570

 
7,731

Nonqualified retirement plan assets
6,813

 
5,808

Other investments
3,667

 
925

Total investments
$
96,752

 
$
89,371
Schedule of Marketable Securities
The composition of the Company’s marketable securities is summarized as follows:
September 30, 2017
 
 
Cost
 
Unrealized
Loss
 
Unrealized
Gain
 
Fair
Value
($ in thousands)
 
 
 
 
 
 
 
Trading:
 
 
 
 
 
 
 
Sponsored funds
$
56,511

 
$
(1,141
)
 
$
1,204

 
$
56,574

Equity securities
12,677

 
—

 
2,555

 
15,232

Available-for-sale:
 
 
 
 
 
 
 
Sponsored closed-end funds
3,694

 
(260
)
 
462

 
3,896

Total marketable securities
$
72,882

 
$
(1,401
)
 
$
4,221

 
$
75,702

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