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EMPLOYEE BENEFIT PLAN (Tables)
6 Months Ended
Jun. 30, 2017
EMPLOYEE BENEFIT PLAN  
Schedule of net periodic benefit cost and related components
  Three months ended
June 30
  Six months ended
June 30
 
(in thousands) 2017  2016  2017  2016 
Interest cost $483  $502  $966  $1,004 
Expected return on plan assets  (589)  (532)  (1,178)  (1,066)
Amortization of net losses  213   199   425   399 
Net periodic benefit cost $107  $169  $213  $337 
Schedule of trading gains (losses) related to SERP assets
  Three months ended
June 30
  Six months ended
June 30
 
(in thousands) 2017  2016  2017  2016 
Trading gains (losses), net $936  $63  $1,552  $(264)