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Debt (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Short-term debt: |  |
Bank Credit Facility, expires October 6, 2015 | $ 38,000 | $ 38,000
Long-term debt: |  |
Long-term debt | 199,825 | 199,809
Total | 237,825 | 237,809
Senior Notes 2015 [Member] |  |
Short-term debt: |  |
Bank Credit Facility, expires October 6, 2015 | 38,000 | 38,000
Senior Notes 2015 [Member] | Senior Note 6.05 % [Member] |  |
Long-term debt: |  |
Long-term debt | 74,942 | 74,935
Senior Notes 2016 [Member] | Senior Note 6.85 % [Member] |  |
Long-term debt: |  |
Long-term debt | $ 124,883 | $ 124,874

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