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Restructuring (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Restructuring [Abstract]
Pre-tax restructuring expenses related to restructuring initiative	$ 4,938
Number of employees receiving severance benefits		337
Restructuring accruals	$ 5,253	$ 5,875

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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