Short and Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule Of Outstanding Debt

	December 31,
(In thousands)	2016		2015
2006 Senior Notes payable through 2021, 5.41%, net of debt issuance costs	$	33,333	$	39,999
2010 Senior Notes payable through 2021, 4.00%, net of debt issuance costs	100,000		100,000
2016 Senior Notes payable through 2031, 3.40%, net of debt issuance costs	67,713		—
Senior revolving credit facility maturing in 2020, net of debt issuance costs	189,456		324,673
Total	390,502		464,672
Amounts due within one year	26,666		6,650
Long-term debt	$	363,836	$	458,022