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Shareholders' Equity (Employee Stock Purchase Plan And 401(k) Plan) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Disclosure Equity Components [Line Items]
Non-cash contribution for 401(k) plan	$ 1,772	$ 1,718
401(k) Plan [Member]
Disclosure Equity Components [Line Items]
Common stock issued to profit sharing retirement plan, shares	26,991	27,240
Non-cash contribution for 401(k) plan	1,772	1,718
Employee Stock Purchase Plan [Member]
Disclosure Equity Components [Line Items]
Common stock issued under employee stock purchase plan, shares	2,962	3,997
Common stock issued under employee stock purchase plan, net proceeds	$ 194	$ 241

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.