Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 30, 2013
Dec. 29, 2012
Assets    
Assets measured at fair value, Adjusted cost $ 35,343  
Asset measured at, fair value 35,367  
Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 35,343 37,866
Assets measured at fair value, Unrealized gains 176 73
Assets measured at fair value, Unrealized losses (152) (239)
Asset measured at, fair value 35,367 37,700
Level 1 [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 2,804 2,538
Assets measured at fair value, Unrealized gains 37 6
Assets measured at fair value, Unrealized losses (93) (114)
Asset measured at, fair value 2,748 2,430
Liabilities    
Liabilities measured at fair value, Adjusted cost 50 293
Liabilities measured at fair value, Unrealized gains      
Liabilities measured at fair value, Unrealized losses      
Liabilities measured at fair value 50 293
Level 1 [Member] | Phantom stock units [Member] | Recurring [Member]
    
Liabilities    
Liabilities measured at fair value, Adjusted cost 50 30
Liabilities measured at fair value, Unrealized gains      
Liabilities measured at fair value, Unrealized losses      
Liabilities measured at fair value 50 30
Level 1 [Member] | Deferred director stock units [Member] | Recurring [Member]
    
Liabilities    
Liabilities measured at fair value, Adjusted cost   263
Liabilities measured at fair value, Unrealized gains     
Liabilities measured at fair value, Unrealized losses     
Liabilities measured at fair value   263
Level 1 [Member] | Equity securities [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 727 602
Assets measured at fair value, Unrealized gains 27 6
Assets measured at fair value, Unrealized losses (92) (86)
Asset measured at, fair value 662 522
Level 1 [Member] | Mutual funds [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 2,077 1,936
Assets measured at fair value, Unrealized gains 10   
Assets measured at fair value, Unrealized losses (1) (28)
Asset measured at, fair value 2,086 1,908
Level 2 [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 32,539 35,328
Assets measured at fair value, Unrealized gains 139 67
Assets measured at fair value, Unrealized losses (59) (125)
Asset measured at, fair value 32,619 35,270
Level 2 [Member] | Corporate fixed income [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 17,379 18,270
Assets measured at fair value, Unrealized gains 113 48
Assets measured at fair value, Unrealized losses (49) (105)
Asset measured at, fair value 17,443 18,213
Level 2 [Member] | Government securities [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 192 195
Assets measured at fair value, Unrealized gains 18 14
Assets measured at fair value, Unrealized losses      
Asset measured at, fair value 210 209
Level 2 [Member] | Municipal bonds [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 3,393 4,525
Assets measured at fair value, Unrealized gains 4 4
Assets measured at fair value, Unrealized losses (9) (15)
Asset measured at, fair value 3,388 4,514
Level 2 [Member] | Certificates of deposit [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 10,335 10,891
Assets measured at fair value, Unrealized gains 2 1
Assets measured at fair value, Unrealized losses      
Asset measured at, fair value 10,337 10,892
Level 2 [Member] | Asset backed securities [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 1,240 1,447
Assets measured at fair value, Unrealized gains 2   
Assets measured at fair value, Unrealized losses (1) (5)
Asset measured at, fair value $ 1,241 $ 1,442