Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 25, 2011		Dec. 26, 2010		Dec. 27, 2009	Jun. 03, 2009
Defined Benefit Plan Disclosure [Line Items]
Percentage of contributions by plan participants	6.00%
Percentage of employer cash contribution	50.00%
Employee service period, minimum	1
Employee service Period, maximum	5
Employer contribution under the plans	$ 1,500,000		$ 1,300,000		$ 1,100,000
Percentage of fair value market Price	85.00%
Employee benefit plan expense	5,668,000		5,228,000		5,719,000
Minimum age of executives for matching contributions to vest immediately	55
Pension plan participation rate	5.00%
Maximum age for executives to receive three year vesting period	55
Expected contributions under pension plan	4,700,000
Discount rate in benefit obligations	4.77%	[1]	5.27%	[1]
Expected rate of return on plan assets	5.75%		4.00%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution by employee stock purchase plan	1.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution by employee stock purchase plan	25.00%
Employee Stock Purchase Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Additional shares reserved for future issuance						400,000
Share reserved for future issuance						650,000
Employee benefit plan expense	600,000		600,000		600,000
Shares authorized under the plan	139,475
Shares issued under the plan	100,475		102,769		132,165
Deferred Compensation Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting period, years	three
Director's Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching contribution to deferred stock account	40,000		46,000		100,000
Executive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution to deferred compensation plan	25.00%
Matching contribution to deferred stock account	$ 200,000		$ 400,000		$ 300,000
Executive Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of salary contribution by employer	50.00%
Percentage of bonus contribution by employer	100.00%

[1] Represents the weighted average rate for all pension plans.