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Non-operating income, net
 12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
2014
 
(In thousands)
Unrealized gain (loss) on contingent interest derivative on Subordinated Convertible Debentures
2,402

 
(14,130
)
 
2,249

Interest income
6,191

 
2,128

 
922

Other, net
1,572

 
1,337

 
1,707

Total non-operating income (loss), net
$
10,165

 
$
(10,665
)
 
$
4,878


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. Interest income is earned principally from the Company’s surplus cash balances and marketable securities.