Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012	May 31, 2012
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 year
Employee service Period, maximum	5 years
Employer contribution under the plans	$ 1,100,000	$ 1,100,000	$ 1,400,000
Percentage of fair value market Price	85.00%
Employee benefit plan expense	6,158,000	6,290,000	5,121,000
Pension plan participation rate	5.00%
Expected contributions under pension plan	4,700,000
Discount rate in benefit obligations	2.01%	3.52%
Expected rate of return on plan assets	3.90%	4.50%	5.25%
Minimum
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution by employee stock purchase plan	1.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution by employee stock purchase plan	25.00%
Executive Officers
Defined Benefit Plan Disclosure [Line Items]
Percentage of salary contribution by employer	50.00%
Percentage of bonus contribution by employer	100.00%
Employer matching contribution to deferred compensation plan	25.00%
Minimum age of executives for matching contributions to vest immediately	55 years
Matching contribution to deferred stock account	100,000	100,000	200,000
Vesting period, years	3 years
Maximum age for executives to receive three year vesting period	55 years
Director
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution to deferred compensation plan	25.00%
Matching contribution to deferred stock account	69,000	56,000	24,000
Employee Stock Purchase Plan
Defined Benefit Plan Disclosure [Line Items]
Additional shares reserved for future issuance				400,000
Share reserved for future issuance				1,050,000
Employee benefit plan expense	$ 600,000	$ 400,000	$ 400,000
Shares authorized under the plan	107,987
Shares issued under the plan	123,210	169,143	139,135