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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Defined Benefit Retirement Plan (Europe) [Member]
        
Components of net periodic benefit cost        
Service cost $ 113 $ 74 $ 229 $ 145
Interest cost 2,542 2,932 5,086 5,770
Expected return on assets (2,817) (3,041) (5,638) (5,975)
Amortization of prior service cost 13 21 26 42
Recognized net actuarial losses 231 155 460 305
Net periodic benefit cost 82 141 163 287
Salary Continuation Plan (SCP) [Member]
        
Components of net periodic benefit cost        
Service cost 113 98 226 196
Interest cost 254 284 507 568
Amortization of transition obligation   55   110
Amortization of prior service cost 12 12 24 24
Amortization of loss 67 95 134 185
Net periodic benefit cost $ 446 $ 544 $ 891 $ 1,083