DEFERRED COMPENSATION PLANS - Narrative (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] | |||
Cash surrender value of life insurance | $ 79,600 | $ 78,100 | |
Deferred compensation arrangement with individual, recorded liability | 874 | 944 | |
Deferred compensation arrangement with individual, compensation expense | 1,416 | 1,127 | $ 849 |
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 | $ 4,962 | $ 3,570 |