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SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (Details)
$ in Thousands
2 Months Ended 12 Months Ended
Feb. 28, 2015
USD ($)
Dec. 31, 2015
USD ($)
multiple
participant
denominator
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Change in benefit obligation:        
Noncurrent liability   $ 22,594 $ 10,916  
Supplemental Executive Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Number of participants | participant   6    
Factor used to determine annual base salary | multiple   12    
Annual base salary period (in months)   24 months    
Age of participant (in years)   65 years    
Minimum period of service (in years)   20 years    
Benefit percentage, tier one (in hundredths)   50.00%    
Benefit percentage, tier two (in hundredths)   25.00%    
Benefit percentage, tier three (in hundredths)   15.00%    
Minimum period of service for prorated benefit (in years)   15 years    
Factor used to determine prorated benefit | denominator   20    
Installment period (in years)   10 years    
Benefit percentage for special participants (in hundredths)   50.00%    
Initial prior service cost for retirement plan   $ 11,700    
Prior service cost expected to be amortized in next fiscal year   1,743    
Change in benefit obligation:        
Benefit obligation, beginning of year $ 10,916 10,916 9,436  
Service cost   1,186 669 $ 646
Interest cost   618 426 343
Actuarial loss   (606) (385)  
Benefit obligation, end of year   22,594 10,916 9,436
Fair value of plan assets   0 0  
Unfunded status of the plan, end of year   22,594 10,916  
Current liability   0 0  
Noncurrent liability   22,594 10,916  
Accumulated benefit obligation   20,000 9,300  
Components of net periodic pension cost [Abstract]        
Service cost   1,186 669 646
Interest cost   618 426 343
Amortization of prior service cost   1,550 584 584
Amortization of loss   0 0 92
Total net periodic benefit cost   $ 3,354 $ 1,679 $ 1,665
Assumptions used to determine the year end benefit obligation [Abstract]        
Discount rate (in hundredths)   3.78% 3.57%  
Rate of compensation increases (in hundredths)   3.50% 3.50%  
Assumptions used to determine the net periodic pension cost [Abstract]        
Discount rate (in hundredths) 3.57% 3.78% 4.51% 3.49%
Rate of compensation increases (in hundredths)   3.50% 3.50% 3.50%
Defined benefit plan threshold of benefit obligation at which actuarial losses are amortized (in hundredths)   10.00%    
Estimated amounts to be amortized from accumulated other comprehensive loss in next fiscal year [Abstract]        
Amortization of prior service cost   $ (1,743)    
Amortization of loss   0    
Total   1,743    
Benefit payments currently expected to be paid [Abstract]        
2016   0    
2017   1,737    
2018   1,818    
2019   1,818    
2020   1,818    
2021-2025   12,497    
Thereafter   23,598    
Defined Benefit Plan, Plan Amendments   $ 9,268 $ 0