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Borrowings (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Components of Debt
Debt consists of the following at December 31: 
(DOLLARS IN THOUSANDS)
Rate
 
Maturities
 
2014
 
2013
Senior notes — 2007
6.40
%
 
2017-27
 
$
500,000

 
$
500,000

Senior notes — 2006
6.14
%
 
2016
 
125,000

 
125,000

Senior notes — 2013
3.20
%
 
2023
 
299,782

 
299,736

Bank overdrafts and other


 

 
12,335

 
984

Deferred realized gains on interest rate swaps
 
 
 
 
5,205

 
7,094

 
 
 
 
 
942,322

 
932,814

Less: Current portion of long-term debt
 
 
 
 
(8,090
)
 
(149
)
 
 
 
 
 
$
934,232

 
$
932,665