CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) [Abstract]
Net earnings available to common stockholders	$ 2,967	$ 6,634	$ 4,098	$ 5,332
Other comprehensive income (loss):
Currency translation adjustment, net of taxes	(834)	(7,448)	(294)	(3,431)
Unrealized losses on marketable securities arising during the period, net of taxes	0	0	0	(31)
Change in unfunded SERP liability, net of taxes	37	85	74	171
Other comprehensive loss	(797)	(7,363)	(220)	(3,291)
Comprehensive income (loss)	$ 2,170	$ (729)	$ 3,878	$ 2,041