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Non-operating (loss) income
 9 Months Ended
Sep. 30, 2015
Non-operating (loss) income, net [Abstract]  
Other Income and Other Expense Disclosure [Text Block]
Non-operating (Loss) Income, Net
The following table presents the components of Non-operating (loss) income, net:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(In thousands)
Unrealized (loss) gain on contingent interest derivative on Subordinated Convertible Debentures
$
(4,747
)
 
$
(6,562
)
 
$
(9,058
)
 
$
3,953

Interest income
639

 
197

 
1,271

 
708

Other, net
133

 
(108
)
 
1,458

 
376

Total non-operating (loss) income, net
$
(3,975
)
 
$
(6,473
)
 
$
(6,329
)
 
$
5,037


Unrealized losses and gains on the contingent interest derivative on the Subordinated Convertible Debentures reflect the change in value of the derivative that results primarily from changes in the Company’s stock price. Interest income is earned principally from the Company’s surplus cash balances and marketable securities.