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EMPLOYEE BENEFIT PLANS: (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
count
Dec. 31, 2011
Dec. 31, 2010
Jan. 02, 2011
item
Jan. 02, 2011
Active participants
item
Jan. 02, 2011
Retired or separated from service and receiving benefits
item
Jan. 02, 2011
Retired or separated from service and entitled to receive future benefits
item
Jun. 30, 2012
Multi-employer defined benefit pension plan
Dec. 31, 2012
Multi-employer defined benefit pension plan
Dec. 31, 2012
Multi-employer defined benefit pension plan
Minimum
Pension plans                    
Credited service period 1 year                  
Pension expense $ 4,327 $ 4,011 $ 4,196              
Percentage of funded status       83.61%            
Employer contributions to profit sharing and retirement savings-investment plan 1,107 1,024 1,043              
Employer contributions to multi-employer defined benefit pension plans 2,131 2,046 1,923              
Pension Plans                    
Number of plan participants       116,708 32,449 54,470 29,789      
Percentage of plan participants         28.00% 47.00% 25.00%      
Targeted period in which plan is projected to emerge from critical status                   10 years
Percentage of annual compounded surcharge for rehabilitation within ten years                 15.00%  
Projection period beyond which plan is projected to emerge from critical status, under the Rehabilitant Plan                 30 years  
Percentage of compounded annual surcharge each year                 5.00%  
Percentage of interim surcharge               5.00%    
Estimated liability upon withdrawal from plan in current year                 37,200  
Deferred compensation                    
Number of deferred compensation plans 3                  
Trading securities fair value $ 49,378 $ 41,768