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Other Long-term Debt (Details Textuals) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
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|---|---|
| Tower Hills Securities [Abstract] | |
| Transfer To Tower Hill Municipal Securities | $ 92.1 |
| Transfer To Tower Hill HPCI Class E Preferred Stock | 86.0 |
| Transfer To Tower Hill Cash | 6.1 |
| Received From Tower Hill Stock | 184.1 |
| Securities Issued By Tower Hill | $ 65.0 |
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