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EMPLOYEE BENEFIT PLAN (Tables)
3 Months Ended
Mar. 31, 2019
EMPLOYEE BENEFIT PLAN  
Schedule of net periodic benefit cost and related components
    Three months ended
March 31,
 
(in thousands)   2019     2018  
Interest cost   $ 490     $ 458  
Expected return on plan assets     (650 )     (709 )
Amortization of net losses     230       206  
Net periodic benefit cost (credit)   $ 70     $ (45 )
Schedule of trading gains (losses) related to SERP assets
    Three months ended
March 31,
 
(in thousands)   2019     2018  
Unrealized gains (losses), net   $ 2,852     $ (486 )