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Income Taxes Narrative (Details) (USD $)	12 Months Ended
Income Taxes Narrative (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Effective income tax rates	30.10%	32.10%	34.80%
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance		$ 3,300,000
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	$ 2,062,000	$ 2,563,000	$ 667,000

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 portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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