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Debt (Tables)
12 Months Ended
Dec. 31, 2014
Debt [Abstract]  
Schedule of Debt
 
2014
 
2013
$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

 
50,000

$125 million Senior Notes, interest 3.84%, due September 19, 2024
125,000

 

$800 million Credit Agreement, interest at LIBOR plus 75 basis points
110,790

 
195,960

Other local arrangements
16,164

 
17,067

 
451,954

 
413,027

Less: current portion
(116,164
)
 
(17,067
)
Long-term debt
$
335,790

 
$
395,960