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Concentration of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2018
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,
($ in thousands)
2018
 
2017
 
2016
Virtus Vontobel Emerging Markets Opportunities Fund
 
 
 
 
 
Investment management, administration and shareholder service fees
$
52,548

 
$
48,826

 
$
49,085

Percent of total revenues
10
%
 
12
%
 
15
%
Virtus Newfleet Multi-Sector Short Term Bond Fund
 
 
 
 
 
Investment management, administration and shareholder service fees
$
54,257

 
$
44,577

 
$
43,579

Percent of total revenues
10
%
 
11
%
 
14
%