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Debt (Tables)
12 Months Ended
Dec. 31, 2017
Debt [Abstract]  
Schedule of Debt
.    DEBT
Debt consisted of the following at December 31:
 
2017
 
2016
3.67% $50 million Senior Notes due December 17, 2022
$
50,000

 
$
50,000

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

 
50,000

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

 
125,000

4.24% $125 million Senior Notes due June 25, 2025
125,000

 
125,000

1.47% EUR 125 million Senior Notes due June 17, 2030
149,736

 
131,507

Debt issuance costs, net
(1,438
)
 
(1,642
)
Total Senior Notes
498,298

 
479,865

$800 million Credit Agreement, interest at LIBOR plus 97.5 basis points(1)
461,872

 
395,191

Other local arrangements
19,677

 
18,974

Total debt
979,847

 
894,030

Less: current portion
(19,677
)
 
(18,974
)
Total long-term debt
$
960,170

 
$
875,056