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DEFERRED COMPENSATION PLANS - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Cash surrender value of life insurance $ 104,100 $ 79,600  
Deferred compensation arrangement with individual, recorded liability 769 874  
Deferred compensation arrangement with individual, compensation expense 739 1,416 $ 1,127
Supplemental Employee Retirement Plan      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Deferred compensation arrangement with individual, recorded liability $ 5,474 $ 4,962