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COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ (2,139) $ (2,710) $ (1,851) $ (1,136)
Other comprehensive loss before reclassifications 374 (1,012) (840)  
Amounts reclassified from accumulated other comprehensive loss 197 153 125  
Other Comprehensive Income (Loss), Net of Tax 571 (859) (715)  
Unrealized Gains and Losses on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (427) (220) (97) 83
Other comprehensive loss before reclassifications (207) (123) (180)  
Amounts reclassified from accumulated other comprehensive loss 0 0 0  
Other Comprehensive Income (Loss), Net of Tax (207) (123) (180)  
Defined Benefit Pension Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (1,237) (1,936) (1,584) (1,240)
Other comprehensive loss before reclassifications 502 (505) (469)  
Amounts reclassified from accumulated other comprehensive loss [1] 197 153 125  
Other Comprehensive Income (Loss), Net of Tax 699 (352) (344)  
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (475) (554) (170) $ 21
Other comprehensive loss before reclassifications 79 (384) (191)  
Amounts reclassified from accumulated other comprehensive loss 0 0 0  
Other Comprehensive Income (Loss), Net of Tax $ 79 $ (384) $ (191)  
[1] This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years ended December 31, 2017, 2016 and 2015.