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Redeemable Noncontrolling Interests (Tables)
 9 Months Ended
Sep. 30, 2018
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest
Redeemable noncontrolling interests for the nine months ended September 30, 2018 included the following amounts:
($ in thousands)
 
Consolidated Investment Products
 
Affiliate Noncontrolling Interests
 
Total
Value at December 31, 2017
 
$
4,178

 
$
—

 
$
4,178

Business acquisition
 
—

 
55,500

 
55,500

Net income (loss) attributable to noncontrolling interests
 
(44
)
 
787

 
743

Net subscriptions (redemptions) and other
 
(173
)
 
—

 
(173
)
Value at September 30, 2018
 
$
3,961

 
$
56,287

 
$
60,248