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Non-operating (loss) income
9 Months Ended
Sep. 30, 2016
Non-operating (loss) income, net [Abstract]  
Other Income and Other Expense Disclosure [Text Block]
Non-operating Income (Loss), Net
The following table presents the components of Non-operating income (loss), net:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands)
Unrealized gain (loss) on contingent interest derivative on Subordinated Convertible Debentures
$
1,440

 
$
(4,747
)
 
$
2,411

 
$
(9,058
)
Interest income
1,728

 
639

 
4,292

 
1,271

Other, net
94

 
133

 
1,389

 
1,458

Total non-operating income (loss), net
$
3,262

 
$
(3,975
)
 
$
8,092

 
$
(6,329
)

Unrealized gains and losses 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.