COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss		$ (1,689)	$ (2,139)	$ (2,710)	$ (1,851)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		326	374	(1,012)
Amounts reclassified from accumulated other comprehensive loss		124	197	153
Other Comprehensive Income (Loss), Net of Tax		450	571	(859)
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss		(266)	(427)	(220)	(97)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		161	(207)	(123)
Amounts reclassified from accumulated other comprehensive loss		0	0	0
Other Comprehensive Income (Loss), Net of Tax		161	(207)	(123)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss		(712)	(1,237)	(1,936)	(1,584)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		401	502	(505)
Amounts reclassified from accumulated other comprehensive loss	[1]	124	197	153
Other Comprehensive Income (Loss), Net of Tax		525	699	(352)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss		(711)	(475)	(554)	$ (170)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(236)	79	(384)
Amounts reclassified from accumulated other comprehensive loss		0	0	0
Other Comprehensive Income (Loss), Net of Tax		$ (236)	$ 79	$ (384)

[1] This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years ended December 31, 2018, 2017 and 2016.