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Shareholders' Equity (Summary Of Activities In Common Stock) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Shareholders' Equity [Abstract]
Stock option exercises, Shares	850	506
Stock option exercises, Amount	$ 9,401	$ 5,572
Employee stock plan purchases, Shares	50	59
Employee stock plan purchases, Amount	$ 2,535	$ 1,832

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.