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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2013
Accumulated Other Comprehensive Income / (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
Foreign currency translation (a)
 
Defined benefit plans (a)
 
Total
 
(dollars in thousands)
Balance at January 1, 2011
$
370

 
$
(350
)
 
$
20

Net change
(260
)
 
25

 
(235
)
Balance at December 31, 2011
110

 
(325
)
 
(215
)
Net change
148

 
423

 
571

Balance at December 31, 2012
258

 
98

 
356

Net change
(10
)
 
246

 
236

Balance at December 31, 2013
$
248

 
$
344

 
$
592