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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Taxes (Textual) [Abstract]
Effective tax rate	22.00%	39.00%
Federal statutory income tax rate	35.00%	35.00%
R&D tax credit recognized during period	$ 1.2
Gross unrecognized tax benefits			2.9
Changes in tax position	$ 0

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

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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