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Shareholders' Equity (Employee Stock Purchase Plan And 401(k) Plan) (Details) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Common stock issued to profit sharing retirement plans, contribution			$ 1,718	$ 489
Employee Stock Purchase Plan [Member]
Common stock issued under employee stock purchase plan, shares	3,395	3,864	7,392	8,118
Common stock issued under employee stock purchase plan, net proceeds	232	215	473	416
401(k) Plan [Member]
Common stock issued to profit sharing retirement plans, shares			27,240	9,975
Common stock issued to profit sharing retirement plans, contribution			$ 1,718	$ 489

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.