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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Stock-Based Compensation
Stock options exercised		22,876
Cash received from the exercise of the options		$ 0.1
Upper limit of intrinsic value of stock options exercised		0.1
Unrecognized compensation cost	10.6
Weighted-average period in years of costs to be recognized	1.9
Unrecognized compensation cost restricted stock and restricted stock units	9.3
Unrecognized compensation cost stock options	$ 1.3

X

- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Number of share options (or share units) exercised during the current period.

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unrecognized compensation cost Restricted stock

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