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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Debt
(In thousands)
March 31, 2018
 
December 31, 2017
2006 Senior Notes payable through 2021, 5.41%, net of debt issuance costs
$
26,667

 
$
26,667

2010 Senior Notes payable through 2021, 4.00%, net of debt issuance costs
80,000

 
80,000

2016 Senior Notes payable through 2031, 3.40%, net of debt issuance costs
76,898

 
74,139

Senior revolving credit facility maturing in 2020, net of debt issuance costs
284,528

 
293,693

Total
468,093

 
474,499

Amounts due within one year, net of debt issuance costs
26,667

 
26,667

Long-term debt, net of debt issuance costs
$
441,426

 
$
447,832