Quarterly report pursuant to Section 13 or 15(d)

PENSION AND RETIREMENT BENEFIT PLANS (Details)

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PENSION AND RETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Retirement Plan [Member]        
Components of net periodic benefit costs are as follows:        
Interest cost $ 174 $ 98 $ 522 $ 293
Service cost 106 188 318 563
Expected return on plan assets (204) (169) (612) 506
Net periodic benefit cost 76 117 228 350
Postretirement Plan [Member]        
Components of net periodic benefit costs are as follows:        
Interest cost 46 21 138 63
Service cost 2 50 6 150
Expected return on plan assets 33 33 99 99
Net periodic benefit cost $ 81 $ 104 $ 243 $ 312