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Summary of Significant Accounting Policies (Details 2) (Cumulative-Effect Adjustment, Deconsolidation of Variable Interest Entity, Tuckerman Fund II, USD $) In Millions | 6 Months Ended
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Jun. 30, 2011
Cumulative-Effect Adjustment, Deconsolidation of Variable Interest Entity | Tuckerman Fund II |
New Accounting Pronouncements or Change in Accounting Principle |
Decrease in opening retained earnings | $ 0.4

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