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Unaudited Quarterly Financial Data (Details Textual) (USD $)	3 Months Ended									12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unaudited Quarterly Financial Data (Textual) [Abstract]
Acquisition related charges			$ 300,000
Impact of Acquisition related charges on EPS			$ 0.01
Restructuring charges	$ 1,700,000		$ 100,000	$ 700,000	$ 4,900,000	$ 1,700,000	$ 3,000,000		$ 2,000,000	$ 2,469,000	$ 7,873,000	$ 2,169,000
Effective income tax rate	11.00%	45.00%	37.00%	50.00%	49.00%	47.00%	43.00%	37.00%
Impact of Restructuring expenses on EPS	$ 0.05		$ 0.00	$ 0.01	$ 0.08	$ 0.03	$ 0.02

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

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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