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EMPLOYEE BENEFIT PLAN (Tables)
9 Months Ended
Sep. 30, 2018
EMPLOYEE BENEFIT PLAN  
Schedule of net periodic benefit cost and related components
    Three months ended
September 30,
    Nine months ended
September 30,
 
(in thousands)   2018     2017     2018     2017  
Interest cost   $ 458     $ 483     $ 1,374     $ 1,449  
Expected return on plan assets     (710 )     (589 )     (2,128 )     (1,767 )
Amortization of net losses     206       213       618       638  
Net periodic benefit (credit) cost   $ (46)     $ 107     $ (136 )   $ 320  
Schedule of trading gains (losses) related to SERP assets
    Three months ended
September 30,
    Nine months ended
September 30,
 
(in thousands)   2018     2017     2018     2017  
Unrealized gains, net   $ 861     $ 428     $ 1,246     $ 1,981