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Debt (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Debt Debt consisted of the following at March 31, 2021:
 March 31, 2021
U.S. DollarOther Principal
Trading
Currencies		Total
3.67% $50 million ten-year Senior Notes due December 17, 2022$50,000 $— $50,000 
4.10% $50 million ten-year Senior Notes due September 19, 202350,000 — 50,000 
3.84% $125 million ten-year Senior Notes due September 19, 2024125,000 — 125,000 
4.24% $125 million ten-year Senior Notes due June 25, 2025125,000 — 125,000 
3.91% $75 million ten-year Senior Notes due June 25, 202975,000 — 75,000 
3.19% $50 million fifteen-year Senior Notes due January 24, 203550,000 — 50,000 
1.47% Euro 125 million fifteen-year Senior Notes due June 17, 2030— 147,197 147,197 
1.30% Euro 135 million fifteen-year Senior Notes due November 6, 2034— 158,973 158,973 
1.06% Euro 125 million fifteen-year Senior Notes due March 19, 2036— 147,197 147,197 
Senior notes debt issuance costs, net(1,073)(1,610)(2,683)
Total Senior Notes
473,927 451,757 925,684 
$1.1 billion Credit Agreement, interest at LIBOR plus 87.5 basis points505,605 127,637 633,242 
Other local arrangements2,196 52,437 54,633 
Total debt981,728 631,831 1,613,559 
Less: current portion(222)(52,283)(52,505)
Total long-term debt$981,506 $579,548 $1,561,054