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Long Term Debt (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 23, 2011
--- | --- | --- | ---
Outstanding long-term debt |  |  |
Total long-term debt | $ 116,951 | $ 118,481 |
Less: current maturities | (8,196) | (8,196) |
Total long-term debt, net of current maturities | 108,755 | 110,285 |
9.57% bond, due May 1, 2018 [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | 5,442 | 6,348 |
10.03% bond, due May 1, 2018 [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | 2,993 | 3,492 |
9.08% bond, due June 1, 2022 [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | 7,960 | 7,958 |
7.83% note, due January 1, 2015 [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | 6,000 | 6,000 |
6.64% note, due October 31, 2017 [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | 16,363 | 16,363 |
5.50% note, due October 12, 2020 [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | 18,000 | 18,000 |
5.93% note, due October 31, 2023 [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | 30,000 | 30,000 |
5.68% note, due June 30, 2026 [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | 29,000 | 29,000 | 29,000
8.25% due March 1, 2014 [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | 1,038 | 1,134 |
Promissory note [Member] |  |  |
Outstanding long-term debt |  |  |
Total long-term debt | $ 155 | $ 186 |

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