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Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Schedule of Debt |
(In thousands) | June 30, 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 | 72,464 |  |  | 74,139 |
Senior revolving credit facility maturing in 2020, net of debt issuance costs | 251,248 |  |  | 293,693 |
Total | 430,379 |  |  | 474,499 |
Amounts due within one year, net of debt issuance costs | 26,667 |  |  | 26,667 |
Long-term debt, net of debt issuance costs | $ | 403,712 |  |  | $ | 447,832 |

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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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