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Shareholders' Equity (Summary Of Activities In Common Stock) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Shareholders' Equity [Abstract]
Puchases of common stock, shares		(335)
Purchases of common stock, Amount		$ (6,839)
Stock option exercises, Shares	93	78
Stock option exercises, Amount	924	343
Employee stock plan purchases, Shares	20	27
Employee stock plan purchases, Amount	$ 509	$ 473

Number of shares issued during the period as a result of an employee stock purchase plan.

Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

Value of stock issued as a result of the exercise of stock options.

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.