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Non-operating (loss) income (Tables)
 9 Months Ended
Sep. 30, 2015
Non-operating (loss) income, net [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
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