Share-Based Compensation (Summary Of Information With Respect To All Outstanding Restricted Stock) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012
Share-Based Compensation [Line Items]
Outstanding as of December 31, 2011, Number of Restricted Stock Shares or Units	1,797
Granted, Number of Restricted Stock Shares or Units	1,317
Vested, Number of Restricted Stock Shares or Units	(348)
Forfeited, Number of Restricted Stock Shares or Units	(310)
Outstanding as of March 31, 2012, Number of Restricted Stock Shares or Units	2,456
Restricted Stock Shares [Member]
Share-Based Compensation [Line Items]
Outstanding as of December 31, 2011, Number of Restricted Stock Shares or Units	1,797
Granted, Number of Restricted Stock Shares or Units
Vested, Number of Restricted Stock Shares or Units	(348)
Forfeited, Number of Restricted Stock Shares or Units	(261)
Outstanding as of March 31, 2012, Number of Restricted Stock Shares or Units	1,188
Outstanding as of December 31, 2011, Weighted Average Grant-Date Fair Value Per Share	24.74
Granted, Weighted Average Grant-Date Fair Value Per Share
Vested, Weighted Average Grant-Date Fair Value Per Share	24.99
Forfeited, Weighted Average Grant-Date Fair Value Per Share	24.70
Outstanding as of March 31, 2012, Weighted Average Grant-Date Fair Value Per Share	24.67
Restricted Stock Units [Member]
Share-Based Compensation [Line Items]
Granted, Number of Restricted Stock Shares or Units	1,317
Forfeited, Number of Restricted Stock Shares or Units	(49)
Outstanding as of March 31, 2012, Number of Restricted Stock Shares or Units	1,268
Granted, Weighted Average Grant-Date Fair Value Per Share	8.63
Forfeited, Weighted Average Grant-Date Fair Value Per Share	8.63
Outstanding as of March 31, 2012, Weighted Average Grant-Date Fair Value Per Share	8.63

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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