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Summary Of Significant Accounting Policies (Details) (USD $)	3 Months Ended
	Mar. 31, 2012
Summary Of Significant Accounting Policies [Abstract]
Restructuring charges	$ 4,007,000

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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