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Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2013
Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in AOCI by component for the nine months ended September 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
 
600

 
3,340

 
(4,630
)
 
(690
)
Less: Net realized gains (losses) reclassified to net income
 
—

 
(610
)
 
7,910

 
7,300

Net current-period change
 
600

 
3,950

 
(12,540
)
 
(7,990
)
Balance, September 30, 2013
 
$
(11,840
)
 
$
2,270

 
$
40,840

 
$
31,270