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Non-operating income, net Non-operating income, net (Tables)
 12 Months Ended
Dec. 31, 2017
Non-operating (loss) income, net [Abstract]  
Schedule of Non-operating Income, 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
)