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STOCK OWNERSHIP AND COMPENSATION PLANS (Supplemental Deferred Compensation Plans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Amended company match percentage of employee contributions 5.00%  
Supplemental Deferred Compensation Plan [Member]    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
SDCP salary deferral 50.00%  
SDCP variable incentive compensation deferral 95.00%  
Amended company match percentage of employee contributions 5.00%  
SDCP accrual $ 51,000 $ 49,000
Funds in a trust pertaining to all participant deferrals and company matching amounts related to the SDCP $ 51,000 49,000
SDCP II [Member]    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Amended company match percentage of employee contributions 25.00%  
SDCP accrual $ 39,000 36,000
SDCP salary deferral monetary 20  
Deferred compensation arrangement with individual, employer contribution $ 5  
SDCP II vesting period 4 years  
SDCP II graded vesting percentage 25.00%  
Cash surrender value of life insurance policies $ 32,000 $ 29,000