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PENSION PLAN AND OTHER BENEFIT PLANS - Changes in Projected Benefit Obligation and Plan Assets, and Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Plan      
Changes in projected benefit obligation [Roll Forward]      
Benefit obligation at beginning of year $ 43,797 $ 45,544  
Service cost 1,047 1,231 $ 1,045
Interest cost 1,883 1,806 1,738
Actuarial (gain) loss 913 (3,199)  
Curtailments (6,161) 0  
Benefits paid (1,688) (1,585)  
Benefit obligation at end of year 39,791 43,797 45,544
Changes in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 39,951 43,336  
Actual return on plan assets 3,297 (1,800)  
Employer contributions 0 0  
Benefits paid (1,688) (1,585)  
Fair value of plan assets at end of year 41,560 39,951 43,336
Funded status of plan 1,769 (3,846)  
Defined Benefit Health Care Plan      
Changes in projected benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 1,664 1,663  
Service cost 43 46 39
Interest cost 66 70 72
Participant contributions 87 83  
Amendments (1,101) 0  
Actuarial (gain) loss 138 215  
Benefits paid (474) (413)  
Benefit obligation at end of year 423 1,664 1,663
Changes in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 0 0  
Employer contributions 387 330  
Participant contributions 87 83  
Benefits paid (474) (413)  
Fair value of plan assets at end of year 0 0 0
Funded status of plan (423) (1,664)  
Executive Supplemental Pension Plan      
Changes in projected benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 1,210 1,244  
Service cost 43 44 38
Interest cost 51 49 55
Actuarial (gain) loss 19 (52)  
Benefits paid (75) (75)  
Benefit obligation at end of year 1,248 1,210 1,244
Changes in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 0 0  
Employer contributions 75 75  
Benefits paid (75) (75)  
Fair value of plan assets at end of year 0 0 $ 0
Funded status of plan $ (1,248) $ (1,210)