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Debt (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Short-term debt: |  |
Short-term debt | $ 38,000 | $ 38,000
Long-term debt: |  |
Long-term debt | 199,777 | 199,744
Total | 237,777 | 237,744
Senior notes 2015 [Member] |  |
Long-term debt: |  |
Long-term debt | 74,922 | 74,908
Senior notes 2016 [Member] |  |
Long-term debt: |  |
Long-term debt | $ 124,855 | $ 124,836

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