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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2014
Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in AOCI by component for the three months ended March 31, 2014 are summarized as follows:
 
 
Defined Benefit Plans
 
 Derivative Instruments
 
Foreign Currency Translation
 
Total
 
 
(dollars in thousands)
Balance, December 31, 2013
 
$
(10,840
)
 
$
1,060

 
$
37,610

 
$
27,830

Net unrealized gains arising during the period
 
—

 
200

 
1,880

 
2,080

Less: Net realized (losses) reclassified to net income (a)
 
(180
)
 
(110
)
 
—

 
(290
)
Net current-period change
 
180

 
310

 
1,880

 
2,370

Balance, March 31, 2014
 
$
(10,660
)
 
$
1,370

 
$
39,490

 
$
30,200