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Debt (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2013
Debt [Abstract] |
Summary of Indebtedness outstanding |
|  | March 31, 2013 |  |  | December 31, 2012 |
Short-term debt: |  |  |  |  |  |  |  |
Bank Credit Facility, expires October 6, 2015 |  | $ | 38,000 |  |  | $ | 38,000 |
Long-term debt: |  |  |  |  |  |  |  |
6.05% Senior Notes, due June 15, 2015. Aggregate principal amount of $75,000 less unaccrued discount of $58 and $65 (6.1% imputed rate) |  |  | 74,942 |  |  |  | 74,935 |
6.85% Senior Notes, due April 15, 2016. Aggregate principal amount of $125,000 less unaccrued discount of $117 and $126 (6.9% imputed rate) |  |  | 124,883 |  |  |  | 124,874 |
Total |  | $ | 237,825 |  |  | $ | 237,809 |

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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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