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Income Taxes Income Taxes Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
US Federal Statutory Tax Rate	35.00%	35.00%
Income Tax Reconciliation, Tax Credits, Research	$ 4.0

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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