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Non-operating income, net
 12 Months Ended
Dec. 31, 2017
Non-operating (loss) income, net [Abstract]  
Non-operating Income, Net
Non-operating Income (Loss), Net
The following table presents the components of Non-operating income (loss), net:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Interest income
$
17,944

 
$
6,191

 
$
2,128

Gain on sale of business
10,421

 
—

 
—

Unrealized (loss) gain on contingent interest derivative on Subordinated Convertible Debentures
(893
)
 
2,402

 
(14,130
)
Other, net
154

 
1,572

 
1,337

Total non-operating income (loss), net
$
27,626

 
$
10,165

 
$
(10,665
)

Interest income is earned principally from the Company’s surplus cash balances and marketable securities. On April 1, 2017, the Company completed the sale of its iDefense business, which resulted in a gain of approximately $10.4 million in 2017. The unrealized gains and losses on the contingent interest derivative on the Subordinated Convertible Debentures reflects the change in value of the derivative that results primarily from the changes in the Company’s stock price. The fair value of the contingent interest derivative for periods after August 15, 2017 is negligible due to the Company’s right to redeem the debentures. Contingent interest after August 15, 2017 was included in Interest expense.