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Restructuring (Tables)
 3 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
The following table presents a summary of the restructuring activity for the three months ended March 31, 2018 and 2017:
 
Severance Charges
 
Total
 
(In thousands)
Accrued charges at December 31, 2017
$
337

 
$
337

Costs paid
(254
)
 
(254
)
Accrued charges at March 31, 2018
$
83

 
$
83

 
 
 
 
Accrued charges at December 31, 2016
$
1,977

 
$
1,977

Costs paid
(618
)
 
(618
)
Accrued charges at March 31, 2017
$
1,359

 
$
1,359