Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

Schedule of Debt

(In thousands)	June 30, 2014		December 31, 2013
Industrial development debt issues payable through 2022, 0.30%	$	—	$	4,000
2006 Senior Notes payable through 2021, 5.41%	53,334		53,334
2010 Senior Notes payable through 2021, 4.00%	100,000		100,000
Senior revolving credit facility maturing in 2019	135,000		110,000
Total	288,334		267,334
Amounts due within one year	6,667		6,667
Long-term debt	281,667		260,667