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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Retirement Plan [Member]        
Components of net periodic benefit costs are as follows:        
Service cost $ 174 $ 98 $ 348 $ 195
Interest cost 106 188 212 375
Expected return on plan assets (204) (169) (408) (337)
Net periodic benefit cost 76 117 152 233
Postretirement Plan [Member]        
Components of net periodic benefit costs are as follows:        
Service cost 46 21 92 42
Interest cost 2 50 4 100
Expected return on plan assets 33 33 66 66
Net periodic benefit cost $ 81 $ 104 $ 162 $ 208