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Non-operating income, net
 12 Months Ended
Dec. 31, 2018
Non-operating (loss) income, net [Abstract]  
Non-operating Income, Net
Non-operating Income, Net
The following table presents the components of Non-operating income, net:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Gain on sale of business
$
54,840

 
$
10,421

 
$
—

Interest income
26,490

 
17,944

 
6,191

Loss on extinguishment of Subordinated Convertible Debentures
(6,554
)
 
—

 
—

Other, net
2,193

 
(739
)
 
3,974

Total non-operating income, net
$
76,969

 
$
27,626

 
$
10,165


On December 5, 2018, the Company completed the sale of the rights, economic benefits, and obligations, in all customer contracts related to its Security Services business, which resulted in a gain of approximately $54.8 million in the fourth quarter of 2018. During the second quarter of 2017, the Company completed the sale of its iDefense business, which resulted in a gain of approximately $10.4 million in 2017. Interest income is earned principally from the Company’s surplus cash balances and marketable securities.