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Employee Retirement Benefit Plans: Components of Net Periodic Benefit Expense (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2011
Pension Plans, Defined Benefit
       
Interest cost $ 467 $ 527 $ 1,402 $ 1,582
Expected return on assets (454) (501) (1,361) (1,502)
Amortization of actuarial loss 171 109 511 322
Settlement charge 352 345 986 900
Net periodic benefit expense 536 480 1,538 1,302
Supplemental Executive Retirement Plan
       
Interest cost 52 64 155 193
Amortization of actuarial loss 14 9 42 27
Amortization of prior year service cost (12) (12) (36) (36)
Net periodic benefit expense $ 54 $ 61 $ 161 $ 184