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EMPLOYEE BENEFIT PLANS (Additional Information) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Maximum age to receive health care coverage 65 years    
Defined Benefit Plan, Accumulated Benefit Obligation $ 80,897 $ 66,576  
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Required service period for employee participation 30 days    
Basic contributions as a percentage of annual salary 50.00%    
Company matching contribution, percent of match 200.00%    
Company matching contribution, percent of employees' annual pay 3.00%    
Contribution to the qualified defined contribution plans $ 12,753 $ 11,364 $ 10,450
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year $ 16,700    
Pension Benefits [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations 60.00%    
Pension Benefits [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations 40.00%