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NET INVESTMENT INCOME (Tables)
 12 Months Ended
Dec. 31, 2017
Net Investment Income [Abstract]  
Net Investment Income (Loss)
A summary of net investment income (loss) for the years ended December 31, 2017, 2016 and 2015 is as follows:
 
 
2017
 
2016
 
2015
 
 
($ in thousands)
Realized gains (losses)
 
$
87,618

 
$
(113,836
)
 
$
22,227

Change in unrealized gains and losses
 
(41,444
)
 
209,993

 
(265,401
)
Investment related foreign exchange gains (losses)
 
(7,653
)
 
2,988

 
(3,725
)
Interest and dividend income, net of withholding taxes
 
25,510

 
23,915

 
15,313

Interest, dividend and other expenses
 
(23,937
)
 
(22,334
)
 
(31,092
)
Investment advisor compensation
 
(19,863
)
 
(24,543
)
 
(19,246
)
Net investment income (loss)
 
$
20,231

 
$
76,183

 
$
(281,924
)