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Fair Value of Financial Instruments Additional Information (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2012
|
|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Maximum investment in Limited Partnerships or Hedge Funds | 1.00% |
|
Senior Notes
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Fair value | 230,000 |
|
Subordinate Debenture
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Fair value | 55,600 |