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Short and Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule Of Outstanding Debt
 
December 31,
(In thousands)
2018
 
2017
2006 Senior Notes payable through 2021, 5.41%, net of debt issuance costs
$

 
$
26,667

2010 Senior Notes payable through 2021, 4.00%, net of debt issuance costs
60,000

 
80,000

2016 Senior Notes payable through 2031, 3.40%, net of debt issuance costs
69,604

 
74,139

Senior revolving credit facility maturing in 2023, net of debt issuance costs
231,707

 
293,693

Total
361,311

 
474,499

Amounts due within one year
20,000

 
26,667

Long-term debt
$
341,311

 
$
447,832