Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax		$ 100,000	$ 100,000	$ 100,000	$ 200,000
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax		0	(100,000)	0	(200,000)
Net earnings		13,073,000	8,858,000	35,256,000	30,325,000
Currency translation		309,000	689,000	(564,000)	1,270,000
Pension plans (1)	[1]	32,000	107,000	84,000	323,000
Short-term investments (2)	[2]	0	(248,000)	0	(415,000)
Comprehensive income		$ 13,414,000	$ 9,406,000	$ 34,776,000	$ 31,503,000

[1] Net of tax effect of less than $0.1 million for both the three and nine months ended September 30, 2018 and $0.1 million and $0.2 million for the same periods in 2017.

[2] Net of tax effect of zero for both the three and nine months ended September 30, 2018 and $(0.1) million and $(0.2) million for the same periods in 2017.