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Summary of Significant Accounting Policies - Foreign Currency (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Accounting Policies [Abstract]
Foreign currency transaction loss	$ (0.1)

- Definition

The net realized foreign currency transaction gain (loss) (pretax) included in determining net income from transactions that were settled as of the balance sheet date.

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