Short-Term and Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule Of Outstanding Debt

	December 31,
(In thousands)	2014		2013
Industrial development debt issues payable through 2022, 0.30%	$	—	$	4,000
2006 Senior notes payable through 2021, 5.41%	46,667		53,334
2010 Senior notes payable through 2021, 4.00%	100,000		100,000
Senior revolving credit facility maturing in 2019	105,000		110,000
Total	251,667		267,334
Amounts due within one year	6,667		6,667
Long-term debt	245,000		260,667