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Shareholders' Equity (Summary Of Activities In Common Stock) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Shareholders' Equity [Abstract]
Puchases of common stock, Shares		(913)
Purchases of common stock, Amount		$ (20,884)
Stock option exercises, Shares	267	312
Stock option exercises, Amount	2,359	1,416
Employee stock plan purchases, Shares	40	49
Employee stock plan purchases, Amount	$ 1,166	$ 924

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.