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Commitments and Contingencies (Details) (Settled litigation, USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 30, 2012 | Sep. 30, 2010 | Sep. 30, 2012 | Mar. 31, 2012
Settled litigation |  |  |  |
Commitments and Contingencies |  |  |  |
Contractual payment sought (in shares) |  | 200,000 |  |
Cash award | $ 1.4 |  |  |
Value of shares retired, which were sought as damages |  |  |  | 0.8
Amount recorded as expense |  |  | $ 0.6 |

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