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Restructuring (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 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

Costs paid
(83
)
 
(83
)
Accrued charges at June 30, 2018
$
—

 
$
—

 
 
 
 
Accrued charges at December 31, 2016
$
1,977

 
$
1,977

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

 
1,359

Costs paid
(335
)
 
(335
)
Accrued charges at June 30, 2017
$
1,024

 
$
1,024