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Non-operating (loss) income
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
 
(In thousands)
Unrealized (loss) gain on contingent interest derivative on Subordinated Convertible Debentures
$
(6,562
)
 
$
(5,286
)
 
$
3,953

 
$
(9,723
)
Interest income
197

 
320

 
708

 
1,583

Other, net
(108
)
 
374

 
376

 
3,932

Total non-operating (loss) income, net
$
(6,473
)
 
$
(4,592
)
 
$
5,037

 
$
(4,208
)

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. Other, net in the nine months ended September 30, 2013 includes a $3.0 million gain on the sale of an investment in the equity securities of a public company.