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Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2013
Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in AOCI by component for the six months ended June 30, 2013 are summarized as follows:
 
 
Defined Benefit Plans
 
 Derivative Instruments
 
Foreign Currency Translation
 
Total
 
 
(dollars in thousands)
Balance, December 31, 2012
 
$
(12,440
)
 
$
(1,680
)
 
$
53,380

 
$
39,260

Net unrealized gains (losses) arising during the period
 
390

 
4,380

 
(10,610
)
 
(5,840
)
Net realized losses reclassified to net income
 
—

 
370

 
—

 
370

Net current-period change
 
390

 
4,750

 
(10,610
)
 
(5,470
)
Balance, June 30, 2013
 
$
(12,050
)
 
$
3,070

 
$
42,770

 
$
33,790