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EMPLOYEE RETIREMENT PLANS - Components of Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of net periodic pension cost [Abstract]      
Service cost $ 1,415 $ 1,186  
Interest cost 875 618  
Supplemental Executive Retirement Plan [Member]      
Components of net periodic pension cost [Abstract]      
Service cost 1,415 1,186 $ 669
Interest cost 875 618 426
Amortization of prior service cost 1,660 1,550 584
Amortization of loss 15    
Total net periodic benefit cost $ 3,965 $ 3,354 $ 1,679