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Short and Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule Of Outstanding Debt |
| December 31,
(In thousands) | 2017 |  | 2016
2006 Senior Notes payable through 2021, 5.41%, net of debt issuance costs | $ | 26,667 |  |  | $ | 33,333 |
2010 Senior Notes payable through 2021, 4.00%, net of debt issuance costs | 80,000 |  |  | 100,000 |
2016 Senior Notes payable through 2031, 3.40%, net of debt issuance costs | 74,139 |  |  | 67,713 |
Senior revolving credit facility maturing in 2020, net of debt issuance costs | 293,693 |  |  | 189,456 |
Total | 474,499 |  |  | 390,502 |
Amounts due within one year | 26,667 |  |  | 26,666 |
Long-term debt | $ | 447,832 |  |  | $ | 363,836 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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