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Management Actions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of restructuring liability [Roll Forward]
Balance, beginning of period	$ 106	$ 1,584
Restructuring action			1,671
Cash payments	0	(1,534)	(87)
Foreign currency adjustments	(7)	(54)
Change in estimate		110
Balance, end of period	$ 99	$ 106	$ 1,584

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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- Definition

Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost.

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