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Accumulated Comprehensive Loss, Reclassification (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
AOCI Attributable to Parent [Abstract]        
Provision for income taxes $ (930) $ (875) $ (1,751) $ (1,622)
NET INCOME 4,846 4,691 9,251 8,938
Amount Reclassified from Accumulated Comprehensive Income (Loss) [Member]        
AOCI Attributable to Parent [Abstract]        
NET INCOME [1] (48) (37) (96) (74)
Defined Benefit Pension Items [Member] | Amount Reclassified from Accumulated Comprehensive Income (Loss) [Member]        
AOCI Attributable to Parent [Abstract]        
Other expenses [1] (62) (47) (123) (93)
Provision for income taxes [1] 14 10 27 19
NET INCOME [1] $ (48) $ (37) $ (96) $ (74)
[1] Amounts in parentheses indicate expenses and other amounts indicate income on the Consolidated Statement of Income.