Income Taxes (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes
Company's effective tax rate	31.40%	31.20%	31.20%	30.20%
Statutory federal tax rate			35.00%
Increase (decrease) in gross unrecognized tax benefits	$ 700,000		$ 2,300,000
Increase in total amount of unrecognized tax benefits that would impact effective tax rate	800,000		2,400,000
Total amount of accrued interest and penalty expense related to unrecognized tax benefits	500,000		500,000		400,000
Unrecognized tax benefits	$ 100,000		$ 100,000

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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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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- Definition

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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