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Employee Benefit and Retirement Plans (Details 5) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Jan. 01, 2011
Actual return on Plan assets:    
Fair value of plan assets at end of period $ 124,407 $ 131,218
Limited Partnerships [Member]
   
Reconciliation of the balance of fair value measurements for Pension Plan assets using significant unobservable inputs    
Fair value of plan assets at beginning of period 9,631 12,925
Actual return on Plan assets:    
Relating to assets still held at the reporting date (384) (2,851)
Relating to assets sold during the period 342  
Purchases, sales and settlements (2,616) (443)
Transfers in and/or out of Level 3 0  
Fair value of plan assets at end of period $ 6,973 $ 9,631