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EMPLOYEE BENEFIT PLAN (Tables)
3 Months Ended
Mar. 31, 2018
EMPLOYEE BENEFIT PLAN  
Schedule of net periodic benefit cost and related components
   

Three months ended

March 31

 
(in thousands)   2018     2017  
Interest cost   $ 458     $ 483  
Expected return on plan assets     (709 )     (589 )
Amortization of net losses     206       213  
Net periodic benefit (credit) cost   $ (45 )   $ 107  
Schedule of trading gains (losses) related to SERP assets
   

Three months ended

March 31

 
(in thousands)   2018     2017  
Unrealized (losses) gains, net   $ (486 )   $ 616