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Concentration of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2017
Risks and Uncertainties [Abstract]  
Summary of Funds Provided Ten Percent or More of Total Revenues
The following funds provided 10 percent or more of the total revenues of the Company: 
 
Years Ended December 31,
 
2017
 
2016
 
2015
($ in thousands)
 
 
 
 
 
Virtus Emerging Markets Opportunities Fund
 
 
 
 
 
Investment management, administration and shareholder service fees
$
48,826

 
$
49,085

 
$
62,329

Percent of total revenues
12
%
 
15
%
 
16
%
Virtus Multi-Sector Short Term Bond Fund
 
 
 
 
 
Investment management, administration and shareholder service fees
$
44,577

 
$
43,579

 
$
49,174

Percent of total revenues
11
%
 
14
%
 
13
%