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Share-Based Compensation Plans (Share-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Share-Based Compensation Plans [Abstract]
Restricted stock units	$ 5,886	$ 4,703
Stock options		9
Employee stock purchase plan	262	230
Share-based compensation plans, Total	$ 6,148	$ 4,942

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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