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Non-operating (loss) income
 6 Months Ended
Jun. 30, 2018
Non-operating (loss) income, net [Abstract]  
Other Income and Other Expense Disclosure [Text Block]
Non-operating Income, Net
The following table presents the components of Non-operating income, net:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Interest income
$
6,583

 
$
3,309

 
$
14,071

 
$
5,554

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

 
(6,554
)
 
—

Gain on sale of business
—

 
10,607

 
—

 
10,607

Other, net
631

 
86

 
947

 
(858
)
Total non-operating income, net
$
660

 
$
14,002

 
$
8,464

 
$
15,303


In the second quarter of 2018, the Company recognized a $6.6 million loss on the extinguishment of the Subordinated Convertible Debentures. During the second quarter of 2017, the Company completed the sale of its iDefense business, which resulted in a gain of approximately $10.6 million.