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EMPLOYEE BENEFIT PLANS: (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jan. 01, 2014
Pension Plans          
Trading Securities   $ 60,584 $ 71,682    
Pension plans          
Employer contributions to profit sharing and retirement savings-investment plan   $ 2,533 2,374 $ 2,347  
Deferred compensation          
Number of deferred compensation plans | item   3      
Pension Plan [Member]          
Pension plans          
Credited service period   1 year      
Pension Expense   $ 3,100 3,134 3,211  
Multi-employer defined benefit pension plan          
Pension Plans          
Percentage of annual compounded surcharge for rehabilitation   5.00%      
Percentage of interim surcharge 5.00%        
Estimated liability upon withdrawal from plan   $ 61,000 56,400    
Insolvent period   20 years      
Pension plans          
Percentage of funded status         65.11%
Employer contributions to multi-employer defined benefit pension plans   $ 2,574 2,588 $ 2,231  
Deferred compensation          
Surcharges included in the employer contributions to multi-employer defined benefit pension plans   $ 447 $ 342