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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Debt
(In thousands)
June 30, 2019
 
December 31, 2018
2010 Senior Notes payable through 2021, 4.00%, net of debt issuance costs
$
60,000

 
$
60,000

2016 Senior Notes payable through 2031, 3.40%, net of debt issuance costs
69,619

 
69,604

Senior revolving credit facility maturing in 2023, net of debt issuance costs
268,761

 
231,707

Total
398,380

 
361,311

Amounts due within one year, net of debt issuance costs
20,000

 
20,000

Long-term debt, net of debt issuance costs
$
378,380

 
$
341,311