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Net Realized Securities Gains (Losses)
12 Months Ended
Dec. 31, 2017
Gain (Loss) on Investments [Abstract]  
Net Realized Securities Gains (Losses)
Net Realized Securities Gains (Losses)
The following summarizes net realized securities gains (losses) for each of the three years in the period ended December 31, 2017 (in thousands):
 
2017
 
2016
 
2015
 
 
 
 
 
 
Net realized gains (losses) on securities
$
13

 
$
(286
)
 
$
14,112

Other (1)
23,015

 
29,828

 
48,845

 
$
23,028

 
$
29,542

 
$
62,957



(1) In 2017, primarily relates to a $19.7 million security gain from an investment in a non-public security. In 2015, primarily relates to a recovery of $35.0 million of an investment in a non-public security written down in prior years.
Proceeds from sales of investments classified as available for sale were $0.4 billion, $0.5 billion and $1.9 billion during 2017, 2016 and 2015, respectively. Gross gains of $16.9 million and gross losses of $2.8 million were realized on these sales during 2015. Gross gains and gross losses for 2017 and 2016 were not material.