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Debt (Tables)
12 Months Ended
Dec. 31, 2013
Debt [Abstract]  
Schedule of Debt
 
2013
 
2012
$100 million Senior Notes, interest at 6.30%, due June 25, 2015
$
100,000

 
$
100,000

$50 million Senior Notes, interest at 3.67%, due December 17, 2022
50,000

 
50,000

$50 million Senior Notes, interest 4.10%, due September 19, 2023
50,000

 

$800 million Credit Agreement, interest at LIBOR plus 75 basis points
195,960

 
197,131

Other local arrangements
17,067

 
41,600

 
413,027

 
388,731

Less: current portion
(17,067
)
 
(41,600
)
Long-term debt
$
395,960

 
$
347,131