Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax		$ 100		$ 100	$ 200		$ 200
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax		400			(100)
Net earnings		10,899		19,896	21,467		42,688
Currency translation		452		(38)	581		683
Pension plans (1)	[1]	108		119	216		239
Short-term investments (2)		769	[2]	0	(167)	[2]	0
Comprehensive income		$ 12,228		$ 19,977	$ 22,097		$ 43,610

[1] Net of tax effect of $0.1 million and $0.1 million for the three months ended June 30, 2016 and June 30, 2017, respectively, and $0.2 million and $0.2 million for the six months ended June 30, 2016 and June 30, 2017, respectively.

[2] Net of tax effect of $0.4 million and $(0.1) million for the three and six months ended June 30, 2017.