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Non-operating (loss) income (Tables)
 6 Months Ended
Jun. 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 income (loss), net:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(In thousands)
Unrealized gain (loss) on contingent interest derivative on Subordinated Convertible Debentures
$
2,708

 
$
5,246

 
$
(4,311
)
 
$
10,515

Interest income
373

 
195

 
632

 
511

Other, net
120

 
(447
)
 
1,325

 
484

Total non-operating income (loss), net
$
3,201

 
$
4,994

 
$
(2,354
)
 
$
11,510