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Stock Compensation Plans (Schedule Of Fair Value For Non-Vested Shares Granted Date Using Weighted-Average Assumptions) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Compensation Plans [Abstract]
Risk-free interest rate	1.04%	1.25%	1.21%
Expected dividend yield	2.34%	2.24%	3.18%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the expected term of a nonvested share or option award issued to other than an employee.

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- Definition

The risk-free interest rate assumption that is used in valuing a nonvested share or option award issued to other than an employee.

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