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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (2,710) $ (1,851)
Other comprehensive income (loss) before reclassifications 147 159
Amounts reclassified from accumulated other comprehensive income (loss) 49 40
Net-current period other comprehensive income (loss) 196 199
Ending balance (2,514) (1,652)
Unrealized Gains and Losses on Marketable Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (220) (97)
Other comprehensive income (loss) before reclassifications 83 213
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net-current period other comprehensive income (loss) 83 213
Ending balance (137) 116
Defined Benefit Pension Items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (1,936) (1,584)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 49 40
Net-current period other comprehensive income (loss) 49 40
Ending balance (1,887) (1,544)
Foreign Currency Items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (554) (170)
Other comprehensive income (loss) before reclassifications 64 (54)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net-current period other comprehensive income (loss) 64 (54)
Ending balance $ (490) $ (224)