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Non-operating income, net
 12 Months Ended
Dec. 31, 2019
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,
 
2019
 
2018
 
2017
 
(In thousands)
Interest income
$
26,596

 
$
26,490

 
$
17,944

Transition services income
15,600

 
1,132

 
—

Gain on sale of business
817

 
54,840

 
10,421

Loss on extinguishment of subordinated convertible debentures
—

 
(6,554
)
 
—

Other, net
247

 
1,061

 
(739
)
Total non-operating income, net
$
43,260

 
$
76,969

 
$
27,626


Interest income is earned principally from the Company’s surplus cash balances and marketable securities. Transition services income and gain on sale of business in 2019 and 2018 relate to the divested security services business. Gain on sale of business in 2017 relates to the divested iDefense business.